Nucleus P undergoes decay in two steps to form nucleus Q. Which decay pathway would give nucleus Q the greatest number of neutrons?
- Aan $\alpha$-particle followed by a $\beta$-particle
- Ban $\alpha$-particle followed by a $\gamma$-ray
- Ca $\beta$-particle followed by another $\beta$-particle
- Da $\beta$-particle followed by a $\gamma$-ray