Which expression is equivalent to (3x^3*y^-4)^-2?

A. y^8/6x^6
B. y^8/9x^6
C. 6x^−6y^8
D. 9y^8/x^6

2 answers

B. y^8/9x^6
None of them, it should be
y^8/(9x^6)