Use the process flow diagram to determine which of these events has the greatest net benefit.

Station A $(1$ worker, $8$ minutes$)-->$ Station B $(1$ worker, $7$ units$/$hr$)-->$ Station C $(1$ worker, $6$ units$/$hr$)-->$ Station D $(1$ worker, $9$ minutes$)$

Group of answer choices

reducing the flow time at Station D from $9$ to $8$ minutes

increasing the capacity at Station C to $7$ units per hour

increasing the capacity at Station B to $8$ units per hour

reducing the flow time at Station A from $8$ to $7$ minutes