project described by:

$\backslash$table$[[$Activity$,\backslash$table$[[$Immediate$],[$Predecessor$]],\backslash$table$[[$Time$],[($days$)]]],[$A$,-,6],[$B$,$A$,2],[$C$,-,8],[$D$,$B$,$ C$,5],[$E$,$D$,7]]$

has a critical path of length of

$15$ days

$22$ days

$17$ days

$18$ days

$20$ days