An ear by any other name will hear differently
Of course, the answer was none of the above. Semantically we have SIX ears! They include two Outer Ears; two Middle ears; and two Inner ears.
Admittedly it was a bad question, and there were misleading drawings; but that's what I'm paid for.
Of course, pragmatically we have two ears, each broken up into three sections which we call the Outer, Middle and Inner ears. But why bother with all this nomenclature at all? It is because they each contribute differently to the hearing process.