Question

in case of 100% elastic collision between two objects
the objects travel separately after collision
the objects stick to each other and travel with a common velocity
the objects stick to each other and come to rest
the objects may or may not travel separately

Explanation:

In a 100% elastic collision, both momentum and kinetic energy are conserved. After the collision, the objects do not stick together (that's inelastic, especially perfectly inelastic where they stick and move with common velocity). Instead, they separate and move with different velocities (or same in some symmetric cases but still separate). The blue option is for perfectly inelastic, orange is incorrect as they don't necessarily come to rest, green is wrong as they do travel separately. So the red option "The objects travel separately after collision" is correct.

Answer:

A. The objects travel separately after collision