Momentum has the same direction as
a. mass
c. gravity
b. velocity
d. none of the above select the best answer from the choices provided a b c d

Momentum has the same direction as .
b. velocity.

Since Momentum = Mass * Velocity, the Momentum will be in the direction of the Velocity resulting in the Momentum. 

If there was no gravity then their would be no downword force on the football to have it return the the grownd, and if there was no friction (mainly air friction) then there would be no opposing force the stop the ball from moving through the air allowing the ball to travle ∞.