A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself.
Let's examine the options:
A. 49 - Divisible by 1, 7, and 49 (not prime). B. 29 - Divisible only by 1 and 29 (prime). C. 69 - Divisible by 1, 3, 23, and 69 (not prime). D. 39 - Divisible by 1, 3, 13, and 39 (not prime).
The number classified as prime is B. 29.