plz first predict the answer before looking at the answer choices, I tried hard but I couldn’t predict the answer. @HoldMyBeer
@m.bukhari26 Just taking a gander here as I don’t know the official answer.
(@Leaderboard if you don’t mind verifying.)
Reasoning: The conclusion of rejecting the Demographic bias is due to the researchers claim that there is no over-representation of older individuals in the fossil samples. Basically the researchers are trying to say that there is a fair representation of all demographics and hence there is no scope of seeing false data.
Ideal Answer: So, in order to undermine this conclusion (finding things to weaken the reasoning given by researchers) we need to find the option that comes closest to dismissing the claim or any other element about misrepresentation of Demographics which can cause serious doubt in the original claim.
A) Potential trap answer, if the old individuals have more fractures, so what? Doesn’t really prove anything to weaken the demographics in the samples.
B) Out of context, but again trap answer as Age is also part of demographics.
C) Doesn’t prove anything to weaken the demographics in the samples, in fact this is a strength to the statement.
D) Points out a critical flaw in the methodology while identifying the age. This means there are more older individuals in the samples than what is considered a fair representation. Hence this is actually an over representation. Bingo!
E) Out of context, as we are not concerned with Behavioral differences.
So, as per me D is the answer, hope this helps!
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very well explained. thank you 
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