E. Assign a deadline to the last task in the project.

Thanks , two questions:

what is the difference of your answer from Choice B above?

And why this is better than the other choices?

Choice B is a constraint, not a deadline.

Why better? Deadlines do not interrupt the scheduling engine nor change calculation of total slack.

You're welcome.

Thanks Julie,

I tried the deadline option as you suggested on a small trial schedule I have. And as you said, it did not affect the calculation of dates, however it DID influence the total slack values, for that activity and the ones coming before that activity (or its predecessors). Or did I do something wrong?