As a spanish speaker, I believe it is
a. Es buena idea que hagas una reservación.
The verb ending is the only thing that changes in present tense form, depending on who does the action. In this case, it is talking about "you" or "tu" meaning that it will end in "-es", or "haces". Therefore the answer would be:
<em>Que haces tu?</em>
1. Where are the friends?
2. What does Margarita like?
3. What is Pablo wearing?
4. Why does Susana not like the painting?
5. According to Julio, what are the colors?
6. What did the friends do after they left the museum?
7. What color are the chairs that the friends are sitting on?
Use the present tense to answer these. Do you need help with verbs?
Eva: No, jamas me ha gustado la leche de frutilla.
