Answer: Choice D
We have 8/27 which can be written as (2/3)^3, so 8/27 is a perfect cube.
Similarly, 125/64 = (5/4)^3, showing that it too is a perfect cube. So far we have eliminated choices A and B.
Choice C is also eliminated because -64 = (-4)^3
Lastly, choice D is not a perfect cube assuming it is 136 because 136^(1/3) = 5.142563 is not rational (ie not a fraction of whole numbers). The same can be said about 1/36 and 13/6 as well.