Editor
The 5th term of $(3a-2b)^{-1}$ is
Difficulty: Easy
A: 
$\frac{77b^{4}}{a^{5}}$
B: 
$\frac{16b^{4}}{243a^{5}}$
C: 
$\frac{17b^{4}}{43a^{5}}$
D: 
$\frac{25b^{3}}{43a^{5}}$