1.Change activity A to be done by resource X instead of Y. X is more experience than Y
2.Move activities M and N in parallel to activity A and B which can increase the risk to 40% and 4 more team members will be required later.
3.Remove a Test from the project management plan.
4.Call Team to work on weekends to speed up work
Option 3 is the only choice but I do n't like 3rd option.
Saket/Manish , Please change the answer no; 3