I would actually still argue it's A, D, and 7

The Premises are as followed:

P - Character is a Vowel

Q - Character is a Number

R - Number is Even

I read the statement as p -> (Q /\ R)

Which says, if P is true, then Q and R must be true.

Meaning, if a vowel, the other side must be a number, and the number must be even.

I understand what you're saying, but in my mind that would be written as:

"If there is a vowel on one side and a number on the other, then the number must be even." which would be P /\ Q -> R, in which case, you would not need to check D.

but it says:

"If there is a vowel on one side then there is an even number on the other side"

If the 'answer' is just A and 7, then it's a very poorly written statement.