Select the option that expresses the given sentence in active voice.

I was given a robot by him.

He gave me a robot.

The correct active voice of the given sentence is He gave me a robot.

The passive voice of the sentence is I was given a robot by him. This sentence is in the simple past tense, which is used to describe an action that happened in the past. The passive voice of the sentence is formed by putting the subject of the active sentence after the verb "to be" and the past participle of the main verb. In this case, the subject of the active sentence is "I" and the main verb is "give." The past participle of "give" is "given." So, the passive form of the sentence is I was given a robot by him.

The active voice of the sentence is formed by putting the subject of the passive sentence before the verb and removing the verb "to be." In this case, the subject of the passive sentence is "him" and the main verb is "give." So, the active form of the sentence is He gave me a robot.

The other options are incorrect because:

• A robot was given to me by him. is in the passive voice.
• A robot by him was given to I. is grammatically incorrect. The word "I" should be "me."
• A robot by him was given to me. is grammatically incorrect. The word "by" should be "to."