Activity

Immediate

Predecessor

Optimistic

Most

Likely

Pessimistic

Sigma

Variance

A

$-$

$2$

$3$

$4$

$0\mathrm{.}333$

$0\mathrm{.}111$

B

$-$

$2$

$5$

$8$

$1$

$1$

C

A

$1$

$2$

$9$

$1\mathrm{.}33$

$1\mathrm{.}78$

D

A

$5$

$5$

$5$

$0$

$0$

E

B$,$ C

$6$

$7$

$8$

$0\mathrm{.}333$

$0\mathrm{.}111$

F

B

$14$

$14$

$14$

$0$

$0$

G

D$,$ E

$1$

$5$

$9$

$1\mathrm{.}333$

$1\mathrm{.}78$

H

G$,$ F

$1$

$4$

$8$

$1\mathrm{.}67$

$1\mathrm{.}362$

Which activities are part of the critical path?

a$.$ A$-$B$-$E$-$G$-$H

b$.$ C$-$D$-$E

c$.$ A$-$C$-$E$-$G$-$H

d$.$ B$-$F$-$H

e$.$ A$-$D$-$G$-$H