A decade after the demise of early entrants such as

OFFICIAL EXPLANATION





MAGOOSH OFFICIAL EXPLANATION


(A) This sentence contains a subject/verb disagreement and parallelism problems.
In the original sentence, the subject is each, which is singular.
Therefore, we must use singular verbs as well: has developed and has.
However, option A uses plural verbs: have developed and have.
In addition, there is a parallelism problem.
→ If we say have either developed... or have..., then the first have connects to both parts.
In other words, this sentence is saying have developed... have have!
We must put the either outside the have developed.

(B) This choice fixes the parallelism problem, but the verbs are still plural.

(C) This choice switches correctly to a singular verb, but changes the meaning unacceptably by omitting the second verb entirely and moving the either marker after the first verb. This choice states that each competitor has developed EITHER new... capabilities OR already existing strengths... However, the original intent is not to say that each competitor has developed already existing strengths; the proper meaning is that each competitor already has existing strengths.

(D) CORRECT. This choice fixes both the subject-verb agreement problem and the parallelism problem.

(E) This choice fixes the subject-verb disagreement, but keeps the parallelism problem.

The correct answer is D.

MY COMMENTS (unrelated to the Official Magoosh solution)

akkichamp , welcome to SC Butler.
We are glad to have you.

People who post are inevitably more comfortable with material than aspirants who do not post.
Why? I have a few suspicions.
One one hand, people who post are forced both to explain and to do something.
Listening to and learning from a video is no substitute for practicing questions.

akkichamp , I am bumping your reply to Best Community Reply.
Nice work, you two.