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Difficulty: Very hardStrengthening Arguments

Archaeologists examining a 3,000-year-old Mediterranean shipwreck discovered several deposits of birch bark pitch, a compound historically used as a waterproof sealant. Because the pitch residues were found exclusively along the inner seams of the vessel's lower cargo hold rather than on the ceramic storage containers themselves, researchers concluded that the pitch was applied directly to seal the ship's wooden timbers during construction, rather than originating from leaked commercial cargo.

Which of the following, if true, most strengthens the researchers' argument?

  1. Chemical analysis revealed that oxidation levels in the pitch residues match those resulting from open-air curing during vessel construction prior to seawater submersion, unlike pitch preserved inside airtight containers.Answer
  2. B
    Timber samples recovered from the ship's lower hull showed severe degradation from long-term seawater seepage, indicating that any sealant applied during construction was ineffective.
  3. C
    Several other Mediterranean shipwrecks from the same historical era contained both birch bark pitch containers and pitch residue along their inner hull seams.
  4. D
    Shipbuilders in the ancient Mediterranean routinely constructed seaworthy vessels using tightly fitted joinery techniques that did not strictly require resinous sealants.
  5. E
    Merchant vessels operating along this maritime trade route commonly carried birch bark pitch to exchange with coastal settlements lacking native birch forests.

Answer

Chemical analysis revealing that oxidation levels in the pitch match open-air curing during vessel construction provides the strongest support for the researchers' conclusion.
The option establishing that chemical oxidation levels in the pitch match open-air curing during ship construction directly supports the conclusion. It provides independent physical confirmation that the pitch was exposed to air during vessel assembly, distinct from pitch kept in airtight cargo containers.

Step-by-Step Solution

1
Deconstruct the argument structure
Premise: Birch bark pitch residues were found only along inner hull seams, not on cargo containers. Conclusion: The pitch was applied as a sealant during ship construction, not leaked from cargo.
Identifying the gap between location of residue and the inferred cause (construction vs. cargo leakage) is required to strengthen the causal claim.
2
Evaluate the mechanism needed to strengthen the conclusion
An optimal strengthening statement will provide direct evidence confirming construction application or ruling out cargo leakage.
The conclusion relies on the unstated assumption that the physical state of the residue matches application during ship building rather than container storage.
3
Assess the correct option against the gap
Showing that the pitch underwent open-air oxidation characteristic of curing during ship assembly directly corroborates the construction hypothesis.
Differentiating the chemical signature of construction sealant from stored cargo pitch confirms the proposed cause.

Key Concept

Strengthening Causal Claims by Validating Data and Ruling Out Alternative Explanations
Estimated Time:2m 0s
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Strengthening Arguments

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