Time left $0$:$55$:$42$

Activity $7$ is directly preceded by two activities $-$ activity $5$ and activity $6.$ Activity $5$ has an expected duration of five and an ES time of six. Activity $6$ has an expected duration of seven and an ES time of seven. Activity $7$ has an expected duration of $10.$ The ES for activity $7$ is:

Select one:

a$.11$

b$.14$

c$.21$

d$.24$

e$.25$

An activity, $A,$ has two succeeding activities, $B$ and $C.$ Given the following information,