To entertain his dog, John throws a tennis ball straight up in the air. Unfortunately, just as it reaches the top of its flight, it is intercepted by a large bird which carries it away which of the following best describes the ball's flight before the bird snatches it? (Ignore air resistance)

a. Gravity does negative work, the gravitational potential energy increases, and the kinetic energy increases.
b. Gravity does positive work, the gravitational potential energy increases, and the kinetic energy increases.
c. Gravity does negative work, the gravitational potential energy increases, and the kinetic energy decreases.
d. Gravity does positive work, the gravitational potential energy increases, and the kinetic energy decreases.
e. Gravity does negative work, the gravitational potential energy decreases, and the kinetic energy decreases.
f. Gravity does positive work, the gravitational potential energy decreases, and the kinetic energy decreases.