Table A

$\backslash$table$[[$Activity$,$Predecessor,Time$($weeks$)],[$A$,--,8],[$B$,$A$,6],[$C$,--,4],[$D$,$C$,9],[$E$,$A$,11],[$F$,$B$,3],[$G$,$D$,$ E$,$ F$,1]]$

Using Table A$,$ what is the earliest completion time for this project?

Multiple Choice

$18$ weeks

$19$ weeks

$20$ weeks

$21$ weeks