In the Amazon rainforest, certain species of mosquitoes are known to transmit diseases from monkeys to humans. Although the outbreak of yellow fever in South America likely originated from infected monkeys, the indigenous tribes of the Amazon have never reported cases of yellow fever. Therefore, it is plausible that these tribes possess some form of natural immunity to the virus.

Which of the following, if true, most seriously undermines this argument?

Answer Choices

Correct answer marked below

A) The mosquitoes that carry yellow fever can also transmit the virus directly between humans without any monkey involvement.

B) The species of monkeys that are carriers of yellow fever are not found in the regions inhabited by the indigenous tribes.

Correct

C) Yellow fever outbreaks in the Amazon have been linked to the introduction of infected monkeys from other regions.

D) Indigenous tribes have developed traditional practices that minimize their contact with mosquitoes.

E) The indigenous tribes have a diet rich in fruits that are known to boost the immune system.

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Explanation

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Official Explanation

Official

The argument suggests that the indigenous tribes have immunity to yellow fever because they have not contracted it despite being in contact with infected monkeys. To weaken this argument, we need evidence that challenges the assumption that they are exposed to the virus. Option B…

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Comments

AnubhavJan 10, 2025

thanks

VighneshOct 3, 2024

this pattern comes up frequently

JahnaviFeb 20, 2024

cheers!

What this question tests

What it tests

Whether you can identify the option that most undermines an argument's conclusion.

Common trap

Choosing an irrelevant objection or one that attacks the premise rather than the reasoning.