If design capacity is $1200$ ?units, effective capacity is $900$ ?units, and actual output is $300$ ?units, utilization is:

A $.$

$33\mathrm{.}3\%$

B $.$

$90\%$

C $.$

$80\%$

D $.$

$25\%$

E $.$

$50\%$

F $.$

$66\mathrm{.}7\%$

G $.$

$75\%$