Answer:
C. 1/128
Step-by-step explanation:
First you should distribute the exponent of 2 to the -5 and get 2^-10. Next since both exponents are negative you should move 2^-10 to the bottom and 2^-3 to the top. Do 2^3 which is 8 and then 2^10 which is 1024. Next to simplify the fraction find the GCF (greatest common factor) and divide both numbers by this. In this case the GCF is 8 so you end up with a 1 on top and a 128 on the bottom.
