Final answer:
2) cat. The subject in the sentence 'the midnight-black cat was angry' is cat.
Step-by-step explanation:
The subject in the sentence 'the midnight-black cat was angry' is cat. The subject of a sentence is the noun or pronoun that performs the action of the verb or is being described. In this sentence, the verb is 'was' and the noun that is being described is 'cat', which makes it the subject.