Answer:
A. A large truck has much larger mass.
Step-by-step explanation:
Momentum is the product of mass and velocity of a body.
P = m x v
A body which has much larger mass than a body having smaller mass travelling at same velocity would have greater momentum.
In the given question, a large truck and a small car are driving down a highway. Even with small velocity, a large truck would have greater momentum because of its large mass than the small car.