The Shoemaker-NEAR Spacecraft Explored Two Asteroids, Mathilde and Eros

The Shoemaker-NEAR spacecraft explored two asteroids, Mathilde and Eros. A big difference between them is that:

A) Mathilde appears to be pile of "rubble" (a collection of separate rocks) while Eros is solid
B) Mathilde is a "real" asteroid, while Eros is a comet that has lost some of its ice
C) Mathilde is always inside the orbit of the Earth, while Eros is always outside our planet's orbit
D) Mathilde is going to impact the Earth, while Eros will never come near our planet
E) you can't fool me, the two asteroids have exactly the same properties; that's why the same spacecraft could explore them