Concept:Rules for addition and product of integers and primes determine the truth of each statement.
Explanation:Check each option using simple examples.
Option A: Take positive 2 and negative -3. Their sum is 2 + (-3) = -1, not zero. So false.
Option B: Add two odd numbers like 3 + 3 = 6, which is even, not odd. So false.
Option C: Add two even numbers like 4 + 6 = 10, which is even. This rule always holds. So true.
Option D: Multiply two primes like 2 × 5 = 10, which is not prime. So false.
Answer:The correct statement is option C: Sum of two even numbers is always an even number.