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soniedarshan
Acme brand aspirin claims to be the best headache relief available on the
market today. To prove this claim, Acme called 10 people and asked them their
thoughts on headache relief products. All 10 of them stated that they
unequivocally use Acme brand aspirin on a regular basis and that they believe
it to be the best headache relief available on the market today.

Which of the following would most weaken this argument?

(A) Acme brand aspirin is highly addictive.
(B) The 10 people called were married to the company’s top 10 executives,
and they were coached on what to say.
(C) Most people choose to suffer silently through their headaches and take no
medicines whatsoever.
(D) This survey was conducted by an independent company.
(E) The 10 people were selected at random.

Only B is the option which weakens the position, as it says that the people were coached to say what they said and their reviews were not authentic.
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soniedarshan
Acme brand aspirin claims to be the best headache relief available on the
market today
. To prove this claim, Acme called 10 people and asked them their
thoughts on headache relief products. All 10 of them stated that they
unequivocally use Acme brand aspirin on a regular basis and that they believe
it to be the best headache relief available on the market today
.

Which of the following would most weaken this argument?

(A) Acme brand aspirin is highly addictive.
(B) The 10 people called were married to the company’s top 10 executives,
and they were coached on what to say.
(C) Most people choose to suffer silently through their headaches and take no
medicines whatsoever.
(D) This survey was conducted by an independent company.
(E) The 10 people were selected at random.

The conclusion is highlighted. The Supporting statements are highlighted. Correct answer invalidates those answer choices. C does that.
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IMO B...it weakens the validity of survey
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The answer is B. Since the test case candidates were related to the employees of the company , there is high chance they could have lied, or be biased about the quality of products from the company of thier partners  , thus weakening the conclusion­
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