Topic: Voice,

Best Answer Explained in Below-:

The correct answer is actually option C) "were followed." The confusion may arise from the structure of the sentences and the use of passive versus active voice.

In the provided sentence, "There was somebody walking behind us. I thought we ______," we are looking for a way to complete the thought about being the subject of an action (being followed) while maintaining the correct grammatical form.

Option A, "were following," is incorrect because it suggests that "we" were the ones doing the following, not being followed.

Option B, "were being following," is grammatically incorrect. The correct passive construction would be "were being followed." However, even with that correction, it still doesn’t fit properly in the context of the sentence.

Option D, "have been followed by somebody," also does not fit, as it indicates a present perfect tense that extends the time frame improperly given the context of the situation.

Thus, option C, "were followed," is the most appropriate choice, as it correctly indicates that we were the recipients of the action (being followed by someone) in a past tense context.