The formulae for four compounds, W, X, Y and Z, are listed below. W: $\text{FeSO}_4$ X: $\text{(NH}_4)_3\text{PO}_4$ Y: $\text{KNO}_3$ Z: $\text{NaCl}$ Which of these compounds should be combined to make a fertiliser that provides the three elements needed for better plant growth?
- AW and X
- BW and Z
- CX and Y
- DY and Z