Please explain this question

Hello,

 

Can anyone please explain this question,

 

http://oi54.tinypic.com/qps7rs.jpg

 

How will the project finish sooner if Activity F finishes immediately? Won't there be another critical path?

 

 

Start-C-D-E-B-Finish?

 

 

Thank you.

I think since now the critical path is shared on the activity F path, so it makes sense to say that the project will finish soon if activity F will finish sooner. Although the wording of the answer is questionable. (The rest 3 options any way are wrong)