The Circular Blade of a Saw Has a Diameter of 7

Multiple Choice

The circular blade of a saw has a diameter of 7 inches and rotates at 2500 revolutions per minute. Find the angular speed in radians per second.

A) $\frac { 875 \pi } { 3 }$ radians per second
B) $\frac { 250 \pi } { 3 }$ radians per second
C) $\frac { 1750 \pi } { 3 }$ radians per second
D) $\frac { 125 \pi } { 3 }$ radians per second
E) $14 \pi$ radians per second