If $$M_o$$ is the mass of an oxygen isotope $$_8O^{17}$$, $$M_p$$ and $$M_N$$ are the masses of a proton and a neutron respectively, the nuclear binding energy of the isotope is

A

$$(M_o - 8 M_p) C^2$$

B

$$(M_o - 8 M_p - 9 M_N) C^2$$

C

$$M_o C^2$$

D

$$(M_o - 17 M_N) C^2$$