(A) : To unscrew a rusted nut, we need a wrench with longer arm.
(R ) : Wrench with longer arm reduces the torque of the arm.

Options

A. Both 'A' and 'R' and true and 'R' is the correct explantation of 'A'
B. Both 'A' and 'R' and true and 'R' is not the correct explantation of 'A'
C. A' is true and 'R' is false
D. A' is false and 'R' is true

Answer

C