In industrial plants, calcium oxide, CaO, and calcium hydroxide, Ca(OH)$_2$, are both employed to remove sulfur dioxide, SO$_2$, from flue gases. Which row gives the correct classification of calcium oxide, calcium hydroxide and sulfur dioxide?
- Acalcium oxide: acidic; calcium hydroxide: acidic; sulfur dioxide: basic
- Bcalcium oxide: acidic; calcium hydroxide: basic; sulfur dioxide: acidic
- Ccalcium oxide: basic; calcium hydroxide: acidic; sulfur dioxide: acidic
- Dcalcium oxide: basic; calcium hydroxide: basic; sulfur dioxide: acidic