The restoring torque 'τ' on a pendulum of string length 'L', bob of mass 'm' and the string making an angle 'θ' with the vertical is given by __________.

• A. τ = L mg sin θ
• B. τ = –L mg sin 2θ
• C. τ = –L mg sin θ
• D. τ = L mg sin 2θ