In the question below select the option (A-D) that best explains the information conveyed in the sentence:
He can't be swimming all day
Answer Details
Option A: it's possible he is not swimming now, best explains the information conveyed in the sentence.
The sentence implies that the person being referred to may have been swimming for a period of time, but it is not likely that they have been swimming all day. Therefore, it is possible that the person is not swimming at the moment. Options B, C, and D are not supported by the sentence.