What are trojan asteroids?
(question 5 in image)

A. Asteroids that pass through the inner Solar System and share Jupiter's orbit around the Sun.

Explanation:

Asteroids are irregular shaped and sized rocky bodies that orbit the sun. These lie in the inner solar system mostly in the asteroid belt which is between orbit of Mars and Jupiter.

Trojan means a small celestial body which shares the orbit with a large celestial body. Trojan asteroids are those asteroids which share the orbit of Jupiter and revolve the sun along with it. There are two regions around Jupiter where Trojan asteroids can be found.