fozzzy wrote:
can someone provide a detailed analysis on this one. Thanks!
The federal rules aimed at protecting human subjects of medical experiments were established to ensure that patients must be warned of potential risks and an independent panel would evaluate the experiment before it was conducted.
The sentence says "evaluate" so we cannot place an "an independent panel" before (is singular). Out B and C.
The sentence also says "were", hence we are talking about the past; so the verb "will" is not correct.
If we are in the past, and we want to make a prediction about the future "would" is correct over "will". This eliminates option D.
A) must be warned of potential risks and an independent panel would
E) would be warned of potential risks and that an independent panel would
The parallelism in A is not correct, E, on the other hand, is perfectly parallel: to ensure patients would be warned and that an independent panel would .