A Uniform Rod Is 2 $\degree$ Above the Horizontal

Multiple Choice

A uniform rod is 2.0 m long.The rod is pivoted about a horizontal,frictionless pin through one end.The rod is released from rest at an angle of 30 $\degree$ above the horizontal.What is the angular acceleration of the rod at the instant it is released?

A) 4.7 rad/s²
B) 6.9 rad/s²
C) 6.4 rad/s²
D) 5.6 rad/s²
E) 4.2 rad/s²