(i) A,
(ii) B and
(iii) C?
Solutions:
I At point A, the pendulum has the most kinetic energy, whereas its potential energy is zero. As a result, K = mgh and U = 0
(ii) At position B, the potential energy increases while the kinetic energy decreases. As a result, K = 0 and U = mgh
(iii) Kinetic energy K = 0 and potential energy U = mgh at position C.