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Difficulty: HardStrengthening Arguments

Analysis of sediment cores from a lake adjacent to a Bronze Age settlement reveals a sudden, steep decline in oak tree pollen accompanied by a dramatic increase in grass pollen around 1200 BCE. Archaeologists conclude that the settlement's inhabitants deliberately cleared the surrounding oak forests to expand agricultural land for crop cultivation. However, several paleoclimatologists contend that a regional shift toward severe aridity during the same period caused the natural die-off of the oak trees. Which of the following, if true, most strengthens the archaeologists' conclusion?

  1. A
    Regional speleothem isotopic records from nearby cave formations indicate that the period around 1200 BCE experienced the most severe prolonged drought in the region over a five-hundred-year span.
  2. B
    Timber extracted from the structural support beams of buildings constructed in the settlement around 1200 BCE shows signs of advanced woodworking techniques.
  3. Sediment layers corresponding to 1200 BCE contain high concentrations of domesticated cereal grain phytoliths and micro-charcoal particles characteristic of controlled field burning, while oxygen-isotope ratios in the same layers indicate stable precipitation levels.Answer
  4. D
    Grass species indigenous to the area typically recover from environmental stress conditions more rapidly than deep-rooted hardwood trees like oaks.
  5. E
    The total estimated human population of the settlement remained virtually unchanged throughout the two centuries preceding 1200 BCE.

Answer

The statement showing high concentrations of domesticated cereal grain phytoliths, controlled field burning charcoal, and stable oxygen-isotope precipitation levels provides the strongest support for the archaeologists' conclusion.
The correct response strengthens the argument on two fronts. First, it offers direct physical proof of human farming activity (cereal phytoliths and controlled slash-and-burn field clearing markers). Second, it disproves the paleoclimatologists' counter-hypothesis by establishing through oxygen isotopes that precipitation remained stable during the period, ruling out drought as a natural cause.

Step-by-Step Solution

1
Deconstruct the argument structure
Premise: Oak pollen dropped while grass pollen spiked around 1200 BCE. Conclusion: Inhabitants cleared forests for crop cultivation. Counter-claim: Natural drought caused the forest die-off.
To strengthen a causal argument challenged by an alternative explanation, one must either rule out the alternative cause or supply direct evidence confirming the proposed mechanism.
2
Evaluate the competing hypotheses
The argument pit anthropogenic land clearing against natural aridity/drought.
The correct option must show evidence of human crop cultivation and/or evidence that drought did not occur.
3
Assess the impact of the correct evidence
Demonstrating cereal phytoliths and controlled burning confirms human agricultural activity, while stable oxygen-isotope ratios disprove the aridity hypothesis.
This dual impact eliminates the primary counterargument while providing direct corroborating evidence for the author's conclusion.

Key Concept

Strengthening Causal Arguments via Alternative Cause Elimination and Direct Evidence
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Topics

Strengthening Arguments

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