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

The fisherman caught a large fish.

A large fish was caught by the fisherman.

The correct option that is the passive form of the sentence is A large fish was caught by the fisherman.

The other options are incorrect because:

• A large fish should be caught by the fisherman is in the modal mood, while the question asks for the passive voice.
• A large fish was catching the fisherman is in the active voice.
• A large fish had been catched by the fisherman is grammatically incorrect. The past participle of the verb "to catch" is "caught," not "catched."