Help with easy vector diagram?

Question

A race car drives at a constant speed clockwise around the track shown in the link below.

http://tinypic.com/view.php?pic=m7vmvd&s=4

Multiple Choice Question:

Referring to the point P on the picture, in roughly what direction is the acceleration vector pointing?

a) Out away from the center of the track

b) In towards the center of the track

c) Toward the bottom of the track

I was thinking the answer might be "a", although I would like to verify this answer and see what others think. I'm not great with vectors yet. Thanks!

Answer 1

b) In towards the center of the track