AjiteshArun wrote:
A clinical trial clinic in California is offering older patients the chance to pay $10,000 to receive blood transfusions from younger people aged 16 to 25; however, scientists say that such transfusions have a much greater likelihood of leading to infections among the recipients than they have to slow down the aging process.
(A) have a much greater likelihood
of leading to infections among the recipients than they have
to slow down Parallelism issue. The structure ... of leading.... is NOT PARALLEL to ... to slow down.... INCORRECT.
(B)
make infections among the recipients much
more likely than
a slowing down of Meaning Issue : the transfusions are not themselves causing infections instead they are leading to infections. Also, there is parallelism issue. INCORRECT.
The sentence never talks about the REASON for this increased likelihood. It may be because of transfusion themselves or the relatively new procedure or low skill level of doctors or poor after-surgery care.
Option B explicitly states that the procedure itself is the REASON for the increased likelihood. This is not the intended meaning of the sentence. (C) are much more likely
to lead to infections among the recipients than they are
to slow down Here the intended meaning is clear and the parallelism is also perfect. CORRECT.(D) make it more likely
to lead to infections among the recipients than
slowingHere, also there is a parallelism issue. ALso, what does "it" refers to here? There is no logical antecedent for it to refer. (E) increases the likelihood of infections among the recipients while slowing down
Usage of while is incorrect here, the two actions are not taking place at the same time or are not simultaneous. INCORRECT.
ALSO, the verb form (or adverb form) LIKELY is preferred to the noun form LIKELIHOOD.