The correct option is A a
Let’s examine the sentence: “My friend has got an appointment in a television company some three months ago.” The sentence is in past tense as it mentions an event that happened “three months ago.” So, it would use all the verbs of past tense only. Therefore, the sentence cannot use the verb “has” as it is the verb of present tense. In fact, the sentence does not require any verb between “has” and “got” as the latter is itself a verb of past tense. So, the error is in Part a of the sentence. Hence, Option A is the correct answer.