Which expression is equivalent to

(a^4bc^6)^3 ?
A. a^7b^4c^9
B. a^12b^3c^6
C. a^4bc^18
D. a^12b^3c^18

The answer is D. a^12b^3c^18. To simplify (a^4bc^6)^3, we raise each term inside the parentheses to the third power. This gives us a^12b^3c^18.