Answer:
The correct answer is: "¡Felicitaciones!" ("Congratulations!").
Explanation:
Getting a Ferrari for your birthday is something to celebrate because it is a really fancy and excellent car (also an extravagant gift), so the normal reaction would be happiness for the person who is getting it. Therefore when a someone learns about that a friend is getting a Ferrari he will be really happy for his friend, thus he will congratulate him.
And that is the reason why he would say "Congratulations" to his friend, which in Spanish is said: "¡Felicitaciones!".
