A Wooden Crate Is at Rest on a Wooden Ramp $\theta$

Multiple Choice

A wooden crate is at rest on a wooden ramp.(µ_s = 0.50;µ_k = 0.20;g = 9.8 m/s²) .Find the angle $\theta$ of the ramp for which the crate will start sliding down the ramp.

A) 26.6 ^$\circ$
B) 63.4 ^$\circ$
C) 32.6 ^$\circ$
D) 57.4 ^$\circ$
E) 45.0 ^$\circ$