To determine which of the given fractions is repeating, we need to examine the denominators. A fraction is repeating if its denominator is not divisible by any prime numbers other than 2 or 5.
Let's check each option:
A. 7/14: The denominator is 14, which is divisible by 2 and 7. It is not a repeating fraction.
B. 3/12: The denominator is 12, which is divisible by 2 and 3. It is not a repeating fraction.
C. 10/16: The denominator is 16, which is divisible by 2 and 8. It is not a repeating fraction.
D. 5/15: The denominator is 15, which is divisible by 3 and 5. It is a repeating fraction since 3 is the only prime factor other than 2 or 5.
Therefore, the fraction that is also repeating is D. 5/15.