Business a level question help!

This is from the 2021 AQA past paper:
16.3)The business has learned that activity E will now take 7 days to complete.
Given this change, state the activities on the critical path. Answer: BEG
Obviously I can upload a picture of the network but can someone tell how you go about getting the answer. Tysmmm in advance

Hi,
So basically when activity E only took 4 days, ACF was the critical path as this was the longest way ( 16 days). However, now that activity E is now 7 days, the longest route is BEG as this will take 18 days, and consequently, the EST and LFT on the last node will change to 18 days too.