Answer: Option 'B' is correct.
Step-by-step explanation:
Milestones are formal project review point used to assess progress and performance.
As Milestones is a way to increase the productivity as well as the profitability of the company.
Milestones are observable and measurable and act as progress flags.
Milestones has zero duration, so, it is independent of time.
So, No work is associated with it.
Hence, Option 'B' is correct.