Choose the correct Active form of the given Passive sentence from the options given below:

This room was cleaned yesterday.

Somebody cleaned this room yesterday.

The correct answer is Somebody cleaned this room yesterday.

The passive voice sentence "This room was cleaned yesterday" can be transformed into the active voice sentence "Somebody cleaned this room yesterday." This is done by identifying the subject of the passive voice sentence (the room) and making it the object of the active voice sentence. The verb is then changed from the passive voice form (was cleaned) to the active voice form (cleaned).