The wires A and B shown in the figure are made of the same material and have radii rA and rB respectively. The block between them has a mass m. When the force F is mg/3, one of the wires break
(a) A will break before B if rA = rB
(b) A will break before B if rA < 2rB
(c) Either A or B may break if rA = 2rB
(d) The lengths of A and B must be known to predict which wire will break