Received his letter yesterday

Explanation:

Meaning of the sentence:
The sentence states that the speaker received someone's letter yesterday.

Verb tense:
In this sentence, the verb tense used is the past simple tense. The past simple tense is used to describe an action that occurred and was completed in the past.

Subject and verb agreement:
The subject of the sentence is "I," which is the first-person singular pronoun. The verb used is "received," which is the past simple form of the verb "receive." The subject and verb agree in number and person.

Choice analysis:
a) Received - This is the correct answer because it is the past simple form of the verb "receive," which correctly matches the verb tense used in the sentence. It also agrees with the subject "I."
b) Was receiving - This is incorrect because it uses the past continuous tense, which implies an ongoing action in the past. However, the sentence does not indicate that the action was ongoing.
c) Had received - This is incorrect because it uses the past perfect tense, which implies that the action of receiving the letter happened before another past action. There is no indication of another past action in the sentence.

Therefore, the correct answer is option 'A': Received.