Which fundamental force is primarily responsible for the β-decay of a neutron, and which property of that force makes the decay confined largely within the nucleus?
a) Strong; its very short range confines the interaction to the nucleus.
b) Electromagnetic; its infinite range allows the emitted particles to travel outward.
c) Weak; its very short range limits the interaction region to nuclear dimensions.
d) Weak; its extremely low strength prevents the force from acting beyond the nucleus.