A. 5/2, 6/2, 7/2
B. 13/4, 14/4, 15/4
C. 12/7, 13/7, 14/7
D. 11/4, 12/4, 13/4

Solution

B. 13/4, 14/4, 15/4

Explanation

There are many rational numbers between 3 and 4

To find 3 rational numbers, we need to multiply and divide both the numbers by 3+1 = 4

Hence, 3 x (4/4) = 12/4 and 4 x (4/4) = 16/4

Thus, three rational numbers between 12/4 and 16/4 are 13/4, 14/4 and 15/4.