surbhi1991
why the answer is A and not B?
Hi surbhi1991.
Given that there is nothing clearly grammatically incorrect in (B), you ask a great question.
Here is the sentence created via the use of (B).
The Jamaican Senate has determined that the prime minister is tasked with appointing thirteen members to its panel, while the opposition's leader can only appoint eight.Because that sentence uses the indicative voice wording "is tasked," that sentence conveys that the Senate has figured out that the prime minister IS tasked with appointing thirteen members.
While that scenario is possible, it's not likely that the point of the sentence would be that the Senate has, say, investigated and figured out how the government works.
Here's the sentence created via the use of (A).
The Jamaican Senate has determined that the prime minister be tasked with appointing thirteen members to its panel, while the opposition's leader can only appoint eight.Because that sentence uses the subjunctive voice wording "be tasked," that sentence conveys that the Senate has, basically, made a command, the command that the prime minister be tasked with appointing thirteen members.
This scenario is much more likely than the one described by the sentence created via the use of (B).
Having said all that, I would add that this is not an official question, and choice (B) in this question is not quite as incorrect as an incorrect answers to official GMAT Sentence Correction questions generally are, as what the version created via the use of (B) conveys is, while unlikely, certainly not impossible.