A nucleus of carbon-10, $^{10}_{6}\text{C}$, undergoes beta-emission and is transformed into a nucleus of boron-10, $^{10}_{5}\text{B}$. For this decay process, what change happens to a nucleon, and how does the quark composition of the nucleon change?
- Aproton to neutron, down becomes up
- Bproton to neutron, up becomes down
- Cneutron to proton, down becomes up
- Dneutron to proton, up becomes down