The correct answer is D. dentista.
This is because the sentence that Beatriz says refers to having pain (dolor) in her teeth (dientes). Then, Luisa advises her to go to the dentist (dentista).
This is the option that makes the most sense because you go to the dentist when your teeth hurt. The other types of doctors don’t make sense for this situation, so the answer is D.
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The correct form is tengo - /Yo tengo quince anos/.
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Answer: Hablan
Explanation: B is hablamos, which will be used if it says we. C is habla, which is describing another person (singular). D is hablas, which is talking about you (tu). So the answer will be a, hablan, because it is talking about they, and in plural version. If its singular, it will be habla. Family consists of multiple members, so it wouldn’t be singular.