1.

1). Only A2). Both B and C3). Only D4). Both A and D

Answer»

The underlined part of the sentence is grammatically incorrect.$

The -ing FORM (Option B) and 'have been' (Option C) form cannot make a grammatically correct sentence.$

Only option A is correct here.$

Hence the correct ANSWER is option 1.$

Note: $

May is used to EXPRESS what is possible, factual, or could be factual.

For example,

He may lose his job.

Might is used to express what is hypothetical, counterfactual, or REMOTELY possible.

For example,

If you HURRY, you might get there on time.



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