The Coefficient of Static Friction Between the Tires of a Car

Multiple Choice

The coefficient of static friction between the tires of a car and the street is m_s = 0.77.Of the following,what is the steepest inclination angle of a street on which a car can be parked (with wheels locked) without slipping?

A) 22.5 $\degree$
B) 30 $\degree$
C) 37 $\degree$
D) 45 $\degree$