Answer:
C. 3 over 20
Explanation:
The square root of 15 will be a never-ending, never repeating decimal (an irrational number).
11 over 25 in decimal form is 0.44. This does not repeat.
3 over 20 in decimal form is 0.15. This does not repeat.
2 over 6 reduces to 1 over 3; in decimal form, this is 0.3 repeating.