JEE Main Physics question

A block moves down a smooth inclined plane of inclination θ. Its velocity on reaching the bottom is v. If it slides down a rough inclined plane of the same inclination, its velocity on reaching the bottom is v/n, where n is a number greater than 1. The coefficient of friction is given by

• (A)μ = tanθ(1 − 1/n²)Correct
• (B)μ = cotθ(1 − 1/n²)
• (C)μ = tanθ(1 − 1/n²)^(1/2)
• (D)μ = cotθ(1 − 1/n²)^(1/2)