A Crate Is Sliding Down A $30^{\circ}$ Incline, Picking Up Speed as It Slides

Multiple Choice

A crate is sliding down a $30^{\circ}$ incline, picking up speed as it slides. Ignore air friction.
-(b) Which force has the smallest magnitude?

A) $\left|\vec{F}_{N}\right|$
B) $\left|\vec{F}_{g}\right|$
C) Both $\left|\vec{F}_{N}\right|$ and $\left|\vec{F}_{g}\right|$ (which are equal)
D) $\left|\vec{F}_{S F}\right|$
E) $\left|\vec{F}_{K F}\right|$