Your project has the following duration estimates for three activities:

Activity 1: Most likely - 9 days; Optimistic - 5 days; Pessimistic - 13 days
Activity 2: Most likely - 9 days; Optimistic - 4 days; Pessimistic - 14 days
Activity 3: Most likely - 9 days; Optimistic - 6 days; Pessimistic - 12 days

Which activity has the highest risk? 

1.    

Activity 1

2.    

Activity 2

3.    

Activity 3

4.    

All three activities have the same risk, because the most likely estimate for the three activities is the same