Select the equivalent expression. \left(3^{-8}\cdot 7^{3}\right)^{-2}=?(3
−8
⋅7
3
)
−2
=?left parenthesis, 3, start superscript, minus, 8, end superscript, dot, 7, cubed, right parenthesis, start superscript, minus, 2, end superscript, equals, question mark
Choose 1
Choose 1

(Choice A)
A
21^{10}21
10
21, start superscript, 10, end superscript

(Choice B)
B
\dfrac{7^6}{3^{16}}
3
16

7
6

​
start fraction, 7, start superscript, 6, end superscript, divided by, 3, start superscript, 16, end superscript, end fraction

(Choice C)
C
3^{16}\cdot 7^{-6}3
16
⋅7
−6