Aldehydes and Ketones Both Contain a Carbonyl Carbon Atom

Aldehydes and ketones both contain a carbonyl carbon atom. They differ in that ___.

A) the carbonyl carbon atom in ketones is attached to two other carbons and in aldehydes, the carbonyl carbon atom is also attached to at least one hydrogen atom.
B) the carbonyl carbon atom in ketones is primary and in aldehydes, the carbonyl is secondary.
C) the carbonyl carbon atom in ketones has a hydrogen attached to it.
D) the carbonyl carbon atom in aldehydes has two carbon atoms attached to it