The following three compounds are given: • calcium carbonate • potassium sulfate • zinc nitrate In which row is the element that makes up the largest percentage by mass in each compound shown? [$A_r$: Ca, $40$; C, $12$; O, $16$; K, $39$; S, $32$; Zn, $65$; N, $14$]
- Acalcium; oxygen; oxygen
- Bcalcium; oxygen; zinc
- Coxygen; potassium; zinc
- Doxygen; potassium; oxygen