2. Which conjecture is true? A. An even number plus 3 is always even. B. An even number plus 3 is always prime. C. An even number plus 3 is always odd. D. A prime number plus 3 is always even

The answer is C. A way to find out is to add a few numbers from that group being specified. If you add 2 or even 100 to 3, the answer will be odd. If you add 12 to 3, you will get 15 which is a composite number. If you were to add 2 to 3, you will get 5 which is an odd number.