physics
posted by Claire .
A ball rolls down a hill mainly because of:
a. an unbalanced torque
b. an unbalanced force
c. its rotational inertia
d. angular momentum
I think it is d  but I am unsure. Any advice?

gravity

im apologize, i forgot to put the answer choices. They are:
a. an unbalanced torque
b. an unbalanced force
c. its rotational inertia
d. angular momentum
This question really confuses me. Isn't it because the center of gravity for the ball is not over it's base support when on an incline? That is not an answer choice so I am not sure what is correct. 
"......because the center of gravity for the ball is not over it's base support when on an incline? ...."

That is just saying that there is an unbalanced torques :) 
thank you so much. I suppose I did understand it, just looking at it from the wrong perspective.

Yes, if it were a block sliding you would have said b  an unbalanced force
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