Calculate the theoretical probability of choosing an even-numbered card from a traditional deck of 52 cards. For this question, face cards are not counted as odd or even. Simplify.

A.7/13
B.4/13
C.20/52
D.5/13

There are 26 even-numbered cards in a traditional deck of 52 cards.

The total number of cards in the deck is 52.

So, the theoretical probability of choosing an even-numbered card is 26/52 which simplifies to 1/2 or 0.5.

Therefore, the answer is D. 5/13.