If we see the second sentence, it uses the verb 'is'which is the helping verb of present tense. The second sentence is the answer to the question given in the first sentence. As both the sentence talking about the same topic, the tense of both would be same. Hence, the first sentence would also be in present tense. Also, the first sentence talks about the action being completed in the present and so the tense is present perfect. So, past participle of the verb, which is 'gone', would be used along with 'has'. The helping verb ‘has’ is used as the subject is singular and the tense is present perfect. So the blanks would require verbs of present tense, which is 'has gone'. Option D is the correct answer as the sentence is in present perfect tense. Option A would not be used as it has verbs of simple past tense. Options B and C cannot be used as they would render the sentence meaningless and grammatically incorrect.