When Is the Weak Nuclear Force Encountered

When is the weak nuclear force encountered?

A) when a neutron is transformed into a proton with the ejection of an electron and a neutrino
B) when a positively charged nucleus repels another positively charged nucleus in the core of a star like the Sun
C) when two quarks interact inside a proton or neutron
D) when an atom absorbs a photon and one of the electrons in the atom is sent into a higher energy level