Select the correct passive form of the given sentence.

Meghna has taken all the cash.

All the cash has been taken by Meghna.

The correct passive form of the given sentence is All the cash has been taken by Meghna.

The active voice of the sentence is Meghna has taken all the cash. This sentence is in the present perfect tense, which is used to describe an action that happened in the past but is still relevant to the present. 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 "cash" and the main verb is "take." The past participle of "take" is "taken." So, the passive form of the sentence is All the cash has been taken by Meghna.

The other options are incorrect because:

• All the cash had been taken by Meghna. is in the past perfect tense, which is used to describe an action that happened in the past before another action happened. There is no other action mentioned in the sentence, so the past perfect tense is not appropriate.
• All the cash had been taking by Meghna. has a typo. The past participle of "take" is "taken," not "taking."
• All the cash was taken by Meghna. is in the simple past tense, but the action of the cash being taken happened in the past and is still relevant to the present. The present perfect tense is more appropriate in this case.
• All the cash is taken by Meghna. is in the present tense, but the action of the cash being taken happened in the past.