A Sample of Iron Absorbs 81

A sample of iron absorbs 81.0 J of heat,upon which the temperature of the sample increases from to If the specific heat of iron is 0.450 J/g-K,what is the mass (in grams) of the sample?

A) 21.2 g
B) 4.29 g
C) -21.2 g
D) 0.0472 g
E) 3.83 g