Definition: You are given a question on astronomy. Astronomy is a natural science that studies celestial objects and phenomena. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input: Where are the Trojan asteroids located?
(A)in the center of the asteroid belt (B)on orbits that cross Earth's orbit (C)surrounding Jupiter (D)along Jupiter's orbit 60° ahead of and behind Jupiter

D