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

A new invention has been made by him.

He has made a new invention.

The correct active voice of the given sentence is He has made a new invention.

The passive voice of the sentence is A new invention has been made by him. This sentence is in the present perfect tense, which is used to describe an action that has happened in the past, but the time of the action is not specified. 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 "he" and the main verb is "make." The past participle of "make" is "made." So, the passive form of the sentence is A new invention has been made 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 "he" and the main verb is "make." So, the active form of the sentence is He has made a new invention.

The other options are incorrect because:

• He was making a new invention. is in the past continuous tense, while the original sentence is in the present perfect tense.
• He had been making a new invention. is in the past perfect continuous tense, while the original sentence is in the present perfect tense.
• He were making a new invention. is grammatically incorrect. The verb "were" should not be used with the past participle of the verb "make."