Answer:
option A.
Step-by-step explanation:
Since the two lumps collide together, it is an inelastic collision. An inelastic collision, in contrast to an elastic collision, is a collision in which kinetic energy is not conserved due to the action of internal friction. Part of the kinetic energy is changed to some other form of energy in the collision
Momentum is conserved in inelastic collisions. This means the correct option is option A.