The correct option is
C Did
Option C: 'Did' indicates performing an action.
In the past simple, the auxiliary (helping) verb 'did' can emphasize an action, for example, 'I did call her several times.'
Here, too, it emphasizes the action 'a wolf did come there'. The boy had lied before and hence the third time the emphasis is laid on the fact that the wolf actually turned up.
Hence option C is correct.
Option A: 'Had' also expresses the past, but the past perfect tense. This tense expresses an action that completed in the past, before another action began in the past. The given sentence does not fit into this scenario.
Option B: 'Was' before the verb 'come' expresses the passive voice. The sentence is in passive voice when the subject receives an action.
The given sentence is in active voice: subject 'wolf' performs the action 'to come'. Hence 'was' is not suitable.
Option D: 'Will' expresses the future tense, indicating that the action is yet to happen. But, the action has already happened. The passage is a narration of the past.
Hence option A, B and D are incorrect.