Concept: A composite number has more than two factors; a prime number has exactly two.Explanation:• 24 is composite: 24=2×12• 41 has only two factors: 1 and 41, so it is prime, not composite.• 39 is composite: 39=3×13• 65 is composite: 65=5×13Answer:The number that is not composite is 41, which is option B.