Which of the following has the largest momentum?

A. A large truck parked in a parking lot.

B. A tightrope walker crossing Niagara Falls.

C. The science building at your school

D. a pickup truck traveling down the highway.

E. A dog running down the street

The only answer that makes sense in defining momentum is D. A pickup truck as more mass than a dog running or a tightrope walker, therefore, D is the correct answer. A and C, objects are not even moving on Earth.