To determine in which voice the subject is performing the action of the verb in each of the sentences, we can identify if the sentences are in the active or passive voice. In the active voice, the subject performs the action of the verb, while in the passive voice, the subject receives the action.
Let's analyze each option:
A: I wish he were more prolific.
- Voice: This sentence is not in a typical active or passive structure regarding action but expresses a conditional wish, so it doesn't fit strictly into either category.
B: We were excited about his first book.
- Voice: The subject "we" is experiencing an emotion (being excited), but it doesn't indicate an action being performed by the subject on another object. It is more of a state of being or feeling.
C: He is an interesting author.
- Voice: The sentence describes the subject "he" and does not involve the subject performing an action of a verb, so it is not best categorized as active or passive voice.
D: You are interested in reading.
- Voice: Here, the subject "you" expresses a state of interest, similar to option B. The sentence doesn't involve an action being performed directly.
Since none of the sentences represent a clear active voice where the subject is performing an action, it's worth noting that:
- None of the sentences are in a conventional active or passive voice concerning an action.
- Option B and D imply emotion or interest rather than action.
Therefore, if we had to categorize which the subject seems to have the most active involvement with respect to an idea, it could be argued that option D ("you are interested in reading") implies the subject's engagement with an action (reading), although it explicitly indicates a state rather than an action. However, none of these sentences truly fit the criteria for active voice in the traditional sense.