Which verb can be both singular and plural?

Out of the following, which is not a present form of a verb?

Out of the following, which one is not a plural form of a verb?

Which is not a third-person singular form of a verb?

Direction: Read the sentence to find out whether there is any grammatical error in it. The error, if any will be in one part of the sentence. The number of that part is the answer. If there is no error, the answer is D. i.e. no error. (Ignore the errors of punctuation if any).

We take this step because our commitment (A)/ does not allow us to remained a part (B)/ of a hypocritical and self-serving organization that makes a mockery of human rights. (C)/ No error (D)

Direction: Read the sentence to find out whether there is any grammatical error in it. The error, if any will be in one part of the sentence. The number of that part is the answer. If there is no error, the answer is D. i.e. no error. (Ignore the errors of punctuation if any).

The decision is counterproductive to American national (A)/ security and foreign policy interests and would make (B)/ it more difficult to advance human rights priorities and aid victims of abuse around the world. (C)/ No error (D)