Consider the process described by the process flow diagram below. Each box describes an activity along with time required to carry out the activity, and the arrows show direction of the flow of material between activities.

The times for carrying out these activities are as follows: A 5 hours; B 10 hours; C 8 hours; D 4 hours; E 6 hours; F 3 hours.

Which of the following changes will reduce the minimum flow time (theoretical flow time) for a job by 4 hours?

Group of answer choices

Reducing time for B and D by 2 hours each

Reducing time for B and E by 2 hours each

Reducing time for C and E by 2 hours each

Reducing time for C and D by 2 hours each