What will be the change in temperature of a \(0.2 \mathrm{~kg}\) iron bar if \(400 \mathrm{~J}\) of energy is transferred into it as heat? \(\left(C_{P}\right.\) for iron \(\left.=450 \mathrm{~J} / \mathrm{kg}^{\circ} \mathrm{C}\right)\)

(a) \(4.4^{\circ} \mathrm{C}\)

(b) \(7.2^{\circ} \mathrm{C}\)

(c) \(6.5^{\circ} \mathrm{C}\)

(d) \(3.9^{\circ} \mathrm{C}\)