The subject is the doer of the action. The correct answer is option (d).
The grammatical structure called the active voice is used in a wide variety of languages around the world. It is the unmarked voice in nominative-accusative languages, including English, for phrases containing a transitive verb. The subject usually completes the activity indicated by the action verb in English phrases. These illustrations show how the subject carries out the action of the verb. Since the user performs the activity or "acts upon" the verb, these expressions are seen as using the active voice.
The placement of the actor (subject) and the activity might help you determine if a phrase is in active or passive voice (verb). You use active voice when the actor comes well before action in a phrase.
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