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Question

Difficulty: HardWeakening Arguments

Archaeologists analyzing a 4th-century BCE Mediterranean shipwreck discovered that all preserved ceramic transport amphorae contained interior traces of pinaceous resin, a substance traditionally used to seal vessel walls against liquid seepage. Because pinaceous resin was significantly more expensive than clay-based sealant alternatives during this era, researchers concluded that the ship's cargo consisted exclusively of high-value luxury wines intended for wealthy buyers, rather than common staples like fish sauce or olive oil. Which of the following, if true, most seriously weakens the researchers' conclusion?

  1. Pinaceous resin was uniquely effective at neutralizing acidic compounds in fish sauce that would otherwise dissolve clay sealants during long voyages.Answer
  2. B
    Contemporary historical registries record that luxury wines exported across the Mediterranean were almost universally packaged in resin-sealed ceramic containers.
  3. C
    Terrestrial excavation sites from the 5th century BCE show that domestic wine storage vessels rarely utilized pinaceous resin sealants.
  4. D
    The shipwreck was located along a trade route primarily utilized by merchant vessels transporting bulk agricultural goods.
  5. E
    Pinaceous resin harvested in the northern Mediterranean was traded extensively throughout neighboring coastal settlements.

Answer

The argument is most weakened by the finding that pinaceous resin was uniquely required to neutralize acidic compounds in fish sauce during long maritime voyages, demonstrating a functional necessity for common goods rather than an indicator of luxury cargo.
The conclusion relies on the assumption that expensive pinaceous resin was chosen strictly to match the high value of luxury wine. The statement regarding fish sauce acidity demonstrates that resin was a chemical necessity for preserving container integrity when transporting fish sauce across sea routes. By showing that cheaper alternatives would fail chemically, this option breaks the assumed link between expensive packaging and high-value cargo, thereby severely weakening the argument.

Step-by-Step Solution

1
Deconstruct the core argument
Premise: Ceramic amphorae on a 4th-century BCE shipwreck were lined with pinaceous resin, which was far more expensive than clay sealants. Conclusion: The cargo was exclusively high-value luxury wine rather than standard staples like fish sauce or olive oil.
Identifying the author's underlying assumption—that expensive sealant was used only because the contents themselves were high-value.
2
Evaluate the vulnerability of the assumption
The argument assumes there is no non-monetary or functional reason to use expensive resin for lower-value staples.
To weaken a causal or motivational claim, an alternative explanation for using the expensive sealant must be established.
3
Assess the correct choice against the vulnerability
If fish sauce contains acidic compounds that destroy cheaper clay sealants on long voyages, merchants were required to use resin regardless of the low market value of fish sauce.
This directly undermines the claim that resin lining proves the presence of luxury wine.

Key Concept

Weakening Arguments by Providing Alternative Explanations for Evidence
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Weakening Arguments

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