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The correct answer is B: "It's the first time she has drunk coca-cola." In the given sentence, "She hasn't drunk coca-cola before," we can see that the action of drinking coca-cola is in the past. Therefore, we need to use the present perfect tense to talk about an action that happened at an unspecified time before now. Option A, "It's time for her to drink coca-cola," suggests that it is currently the right time for her to drink coca-cola, but it doesn't convey the idea of it being the first time. Option C, "It's the first time since she drank coca-cola," uses the simple past tense, which is incorrect because we need to use the present perfect tense to indicate an action that happened before now. Option D, "It is time she drank coca-cola," uses the simple past tense, which again is incorrect. We need to use the present perfect tense to indicate an action that happened before now. Therefore, the correct answer is B: "It's the first time she has drunk coca-cola."