Solve the Problem $85 \%$ B) $60 \%$ C) $75 \%$ D) $70 \%$

Solve the problem.
-135 students attended an assembly at Piper School. The student enrollment at the school is 540 . What percentage of the students did not attend the assembly?

A) $85 \%$
B) $60 \%$
C) $75 \%$
D) $70 \%$