The table sets out a comparison of $\alpha$-radiation, $\beta$-radiation and $\gamma$-radiation. Which row is correct?
- A$\alpha$-radiation: more ionising than $\beta$ or $\gamma$; $\beta$-radiation: a proton; $\gamma$-radiation: electromagnetic radiation
- B$\alpha$-radiation: less ionising than $\beta$ or $\gamma$; $\beta$-radiation: an electron; $\gamma$-radiation: two protons and two neutrons
- C$\alpha$-radiation: more ionising than $\beta$ or $\gamma$; $\beta$-radiation: an electron; $\gamma$-radiation: electromagnetic radiation
- D$\alpha$-radiation: less ionising than $\beta$ or $\gamma$; $\beta$-radiation: electromagnetic radiation; $\gamma$-radiation: a proton