For a process with the following operations, what will be the activity efficiency if the process is run as a primed line?

Operation A Operation B Operation C Operation D

C$/$T mins $21191719$

Bottleneck C$/$T $21$

Shift time mins $360$

Group of answer choices

$87\mathrm{.}2\%$

$89\mathrm{.}3\%$

$84\mathrm{.}0\%$

$91\mathrm{.}0\%$