Find the Measure (In Radians) of a Central Angle $\theta$ , That Intercepts an Arc on a Circle with Radius

Multiple Choice

Find the measure (in radians) of a central angle, $\theta$ , that intercepts an arc on a circle with radius 28 ft and arc length 21 ft.

A) 1.3 radians
B) 0.8 radians
C) 588.0 radians
D) 7 radians