B

Centripetal acceleration is given by the formula:
$$ a_c = \frac{v^2}{r} $$
where $v$ is the linear speed of the object and $r$ is the radius of the circular path.
Option B shows the correct formula for centripetal acceleration, which indicates that the acceleration is directed towards the center of the circle and is a function of the speed and the radius. Other options either describe different forms of acceleration or rotational dynamics.
Therefore, Option B is correct.