Solids $W$, $X$, $Y$ and $Z$ are compounds made from two different Group II metals. Their uses are outlined below. Compound $W$ serves as a refractory lining material in kilns. Compound $X$ is used as a construction material. It may also be heated in a kiln to produce compound $Y$. When $Y$ is hydrated, compound $Z$ is formed; this is used in agriculture to treat soils. Which statements about these compounds are correct?
- A1, 2 and 3
- B1 and 2 only
- C2 and 3 only
- D1 only