If the optimistic time, most likely time and pessimistic time for activity A are 4, 6 and 8 respectively and for activity B are 5, 5.5 and 9 respectively, then______________?

A. expected time of activity A is greater than the expected time of activity B
B. expected time of activity B is greater than the expected time of activity A
C. expected time of both activities A and B are same
D. none of the above