An Object Is Moving on a Circular Path of Radius $\pi$

Multiple Choice

An object is moving on a circular path of radius $\pi$ meters at a constant speed of 4.0 m/s.The time required for one revolution is:

A) "2/ $\pi$ ² s"
B) " $\pi$ ²/2 s"
C) " $\pi$ /2 s"
D) " $\pi$ ²/4 s"
E) "2/ $\pi$ s"