HSC BUSINESS PAPER - CPA (1 Viewer)

[moon_princess]

can someone tell me why the answer is D? When we calculate CPA, isn't it ironically the longest path, thereby the answer being B? Please help Thanks in advance

 

[AKONS]

The answer should be D.

The longest path is ABCD at 7 days (including day after D). The path ABEF is shorter but also reaches D. So by the time path ABCD is done, so should the tasks E and F as well, as they are conducted simultaneously.