Direction: Factors of a number which are prime are called its prime factors. Factors of 36 are: 1, 2, 3, 4, 6, 9, 12, 18. Prime factors of 36 are: 2, 3. A number can be written as a product of its prime factors, e.g.\[36=2\times 2\times 3\times 3\]. A factorization in which every factor is prime is called prime factorization of the number. Two numbers are co-prime if they have only 1 as the common factor. Based on the information given above answer the following questions. Prime numbers between 20 and 40 are

• A. 23, 29, 31, 32             
• B. 23, 29, 31, 37
• C. 21, 25, 27, 29             
• D. 33, 35, 37, 39