$\mathrm{A} C D$ Has a Diameter Of $12.0 \mathrm{~cm}$ If The Has

Multiple Choice

$\mathrm{A} C D$ has a diameter of $12.0 \mathrm{~cm}$ . If the $\mathrm{CD}$ is rotating at a constant frequency of 4.00 rotations per second, then the period of the rotational motion is

A) $0.750 \mathrm{~s}$ .
B) $1.25 \mathrm{~s}$ .
C) $0.500 \mathrm{~s}$ .
D) $0.250 \mathrm{~s}$ .
E) $1.00 \mathrm{~s}$