Which two statements suggest that metal M may have a proton number between $21$ and $30$? 1 It is able to conduct electricity. 2 It does not react with water. 3 It produces two basic oxides with formulae $\text{MO}$ and $\text{M}_2\text{O}_3$. 4 It produces two coloured sulfates.
- A1 and 2
- B1 and 4
- C2 and 3
- D3 and 4