If M₀ is the mass of an oxygen isotope 8O¹⁷, Mp and Mn are the masses of a proton and a neutron, respectively, the nuclear binding energy of the isotope is

A. (Mₒ−8Mₚ)c²
B. (8Mₚ+9Mₙ−Mₒ)c²
C. Mₒc²
D. (Mₒ−17Mₙ)c²