HELP PLS PLS PLS?

B.) 9/5

Explanation:

-\frac{1}{4}\left(-\frac{\frac{4}{5}}{\frac{2}{3}}\right)\cdot \:6

=\frac{1}{4}\cdot \frac{\frac{4}{5}}{\frac{2}{3}}\cdot \:6

=\frac{1}{4}\cdot \frac{4\cdot \:3}{5\cdot \:2}\cdot \:6

=\frac{1}{4}\cdot \frac{2\cdot \:3}{5}\cdot \:6

=\frac{1}{4}\cdot \frac{2\cdot \:3}{5}\cdot \frac{6}{1}

=\frac{1}{2}\cdot \frac{3}{1}\cdot \frac{2\cdot \:3}{5}

=\frac{1\cdot \:3\cdot \:2\cdot \:3}{2\cdot \:1\cdot \:5}

=\frac{18}{2\cdot \:1\cdot \:5}

=\frac{18}{10}

\frac{2\cdot \:9}{10}

=\frac{2\cdot \:9}{2\cdot \:5}

=\frac{9}{5}

c

explanation:

it should be a. song dynasty’s civil service examination system created an administrative bureaucracy manned by the landed aristocracy.