a^3b^6,Option A
Step-by-step explanation:
(a^-6b/a^-5b^3)^-3
By the law of indices,
a^-6×-3b^-3/a^-5×-3 b^3×-3
a^18b^-3/a^15b^-9
a^(18-15)b^-3-(-9)
a^3b^-3+9
a^3b^6
