was
is
has been
had been
Answer is Wrong!
Answer is Right!
The correct answer is A. was.
The sentence is in the past tense, so we need to use a past tense verb. Of the four options, only was is a past tense verb.
B. is is in the present tense, and C.
has been and D. had been are in the perfect tense. The perfect tense is used to talk about something that happened before a specific time in the past. In this sentence, there is no specific time in the past mentioned, so we cannot use the perfect tense.Therefore, the correct answer is A. was.