Correct option is B
Concept Used:
Prime numbers are numbers which have only two factors namely, 1 and themselves. For example, 2, 3, 19 etc.
Solution:
The prime numbers less than 50 are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47.
∴ The number of prime numbers less than 50 is 15