The correct option is
D went
Answer : C
Explanation:
The simple past tense is used to talk about the things that happened / existed in the past / before the present time.
And judging by the grammatical construction of the sentence, the years mentioned in the statement that "He" attended Oxford University in 1975 and then again in 1982.
Therefore to correctly complete the sentence we have to fill the blank with a word (verb) that indicates the past tense.
--go : base form / root form verb
--has gone : present perfect form
--went : past form of go
--goes : present single tense for third person singular
Thus clearly, the most suitable option is "went" as it is the past form of the verb "go".
Therefore the correct complete sentence is:
He WENT to Oxford University in 1975, and in 1982.