Answer: 
<u>Step-by-step explanation:</u>






Option D is the correct answer
B. You don’t exactly need a reason do you?
(1) Repetition allowed : There are 4 choices for both positions, so 4 × 4 = 16 2-digit numbers can be formed. (2) Repetition not allowed : There are 4 options for tens position, and three options for ones position. Therefore, 4 × 3 = 12 2-digit numbers can be formed.