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 μ_s = 0.70.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) 30°
B) 40°
C) 35°
D) 45°
E) ​32°