what factor determines whether Solar System debris (asteroids, comets, ect.) is mostly made up of rock or ice?

Question

a) the eccentricity of its orbit
b)the semi-major axis
c)the mass of the debris
d) the physical size of the debris
e) how often the debris is involved in collisions

Answer 1

a.

Answer 2

Hi. Jason H is correct. Answer A assumes that the eccentricity brings the object close enough to the Sun to sublimate any ice, leaving mostly rock and dust. And any object with a highly eccentric orbit would spend part of the time closer to the Sun.