The Mass of a Proton Is 1

The mass of a proton is 1.673 × 10^-24 g. The mass of a neutron is 1.675 × 10^-24 g. The mass of the nucleus of an ⁵⁶Fe atom is 9.289 × 10^-23 g. What is the nuclear binding energy (in J) for a ⁵⁶Fe nucleus? (c = 3.00 × 10⁸ m/s)

A) 2.57 × 10^-16
B) 7.72 × 10^-8
C) 8.36 × 10^-9
D) 7.65 × 10^-11
E) 6.07 × 10⁶