Select the option that is the passive form of the sentence.

The batsman had hit the ball towards the boundary.

The ball had been hit towards the boundary by the batsman.

The correct passive form of the sentence is The ball had been hit towards the boundary by the batsman.

The active voice of the sentence is The batsman had hit the ball towards the boundary. This sentence is in the past perfect tense, which is used to describe an action that happened in the past before another action happened. 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 "ball" and the main verb is "hit." The past participle of "hit" is "hit." So, the passive form of the sentence is "The ball had been hit towards the boundary by the batsman."

The other options are incorrect because:

• The ball is hit towards the boundary by the batsman. This sentence is in the present tense, but the action of the ball being hit towards the boundary happened in the past.
• The ball is being hit towards the boundary by the batsman. This sentence is in the present progressive tense, which is used to describe an action that is happening now but is not finished.
• The ball was hit towards the boundary by the batsman. This sentence is also in the past tense, but it is not as emphatic as the correct option.