The correct option is
A Were damaged
NOTE: When we talk about actions done to non-living things, we use the object as subject. Hence, the given sentence is in the passive voice.
Looking at the first sentence, we understand that the action happened in the past and hence we will use the simple past tense.
We use 'was/were' with the verb in the past participle form to form the sentence in the simple past tense in the passive voice.
Option B - 'Are being damaged' can be used in the passive voice to form the sentence in the present continuous tense. Thus option B is incorrect.
Option C - 'Are damaged' can be used in the passive voice to form the sentence in the simple present tense. Hence, option C is incorrect.
Option D - 'Were being damaged' can be used in the passive voice to form the sentence in the past continuous tense. Thus option D is incorrect.
Option A - 'Were damaged' can be used here because the subject of the given sentence is plural, hence we can use 'were'. Also, the verb 'damaged' is in the past participle form. Thus option A is the correct answer.
'There was a fire at the hotel last week. Two of the rooms were damaged.'