Name the type of forces involved in the following :
(a) A horse pulling a cart.
(b) A sticker attached to steel almirah without glue.
(c) A coin falling to the ground on slipping from hand.
(d) A plastic comb rubbed in dry hair picking up tiny pieces of paper.
(e) A moving boat coming to rest when rowing is stopped.
(A) Muscular force
(B) Magnetic force
(C) Gravitational force
(D) Electrostatic force
(E) Frictional force