Discussion
Nuclear forces are :
Answer: B
Nuclear forces are spin dependent and have a non-central part.
The deuteron is bound only in the spin-1 state, and neutron-proton scattering differs for singlet and triplet spins, which shows spin dependence. The deuteron also has an electric quadrupole moment, meaning it is not spherical, which requires a non-central tensor force that depends on the orientation of the spins relative to the line joining the nucleons.
Each of the other options denies one of these two experimentally established features.
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