$22232424$

$\backslash$table$[[$Activity$,\backslash$table$[[$Preceding$],[$activity$]],$Optimistic,Pessimistic,Most likely$],[$A$,,1,7,5],[$B$,$A$,4,8,6],[$C$,$A$,5,7,6],[$D$,$B$,1,5,3],[$E$,$C$,2,5,4],[$F$,$D$,$ E$,2,6,4],[$G$,$C$,4,8,5],[$H$,$F$,$ G$,3,5,4]]$

What is the earliest time to finish the project?

$18\mathrm{.}7$

$20$

$21\mathrm{.}7$

$22\mathrm{.}5$

$26\mathrm{.}2$