Select the correct passive form of the given sentence.

The storm last night uprooted a large number of trees.

A large number of trees were uprooted by the storm last night.

The correct passive form of the given sentence is A large number of trees were uprooted by the storm last night.

The active voice of the sentence is The storm last night uprooted a large number of trees. This sentence is in the simple past tense, which is used to describe an action that happened in the past. 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 "the storm last night" and the main verb is "uproot." The past participle of "uproot" is "uprooted." So, the passive form of the sentence is A large number of trees were uprooted by the storm last night.

The other options are incorrect because:

• A large number of trees have been uprooted by the storm last night. is in the present perfect tense, while the original sentence is in the simple past tense.
• The storm last night was uprooted by a large number of trees. is grammatically incorrect. The subject of the sentence is "the storm last night," but the action of being uprooted is being performed by the trees.
• A large number of trees uprooted the storm last night. is grammatically incorrect. The trees cannot uproot a storm.