An Object Is Initially at Rest on the Ground

Multiple Choice

An object is initially at rest on the ground. After a series of motions, it ends up at rest on a tower of height h. Which of the following statements is true?

A) Gravity was the only force acting on the body.
B) At least one other force besides gravity must have acted on the body during some steps so that its vertical component was larger than the force of gravity.
C) The magnitude of the net force acting on the body was zero every step of the way.
D) The work done by the net force acting on the body was zero even if the magnitude of the net force acting on the body was not zero every step of the way.
E) The work done by the net force acting on the body was zero, and the magnitude of the net force acting on the body was zero every step of the way.