One of the more bizarre powers of the U.S. presidency is the more or less __________ authority to grant pardons, negating months or even years of criminal litigation in an instant.

This is a straight question. No shift, no twist, and turn. Just one direction.

We must take into account the following: negating months or even years of criminal litigation in an instant.

Changing a situation in a snap, or modifying the course of action in one second.

Going by poe the first word to think is E. sweeping= wiped out= blow away in one second.

Now we need a pair word that keeps the SAME meaning or alike

A. impartial

Not for sure

B. unqualified

Not sure of this

C. unbiased

No for sure. At the very least the pardon could be biased because is a unilateral decision by the president

D. executive

we already know this. The US president takes executive actions

E. sweeping

correct

F. tyrannical

Off or out of scope

The only pair is B which apparently makes no sense. However, unqualified means no limits just because has no possible categorization. Therefore, it is correct

Let me know if this is clear or you need further explanations

This is clear, "we already know this. The US president takes executive actions" especially helps.
Thank you.