What causes friction? A. Inertia

B. Tiny collisions, called microwelds, on surfaces, even those that

seem smooth

C. Action - Reaction

D. All surfaces are rough to the touch and therefore cause friction

The best answer all surfaces are rough to the touch and therefore cause friction bcz when two surfaces are on each other there is formation of cold welds which increases friction

Explanation:

I hope this will help you :)

the area between the graph and the t axis