$\backslash$table$[[$ACTIVITY$,$a$,m,$b$,\backslash$table$[[$Immediate$],[$predecessors$]]],[$A$,1,2,3,-],[$B$,2,3,4,-],[$C$,4,5,6,$A$],[$D$,8,9,10,$B$],[$E$,2,5,8,$C$,$ D$],[$F$,4,5,6,$D$],[$G$,1,2,3,$E$]]$

From the provided table, determine the expected completion time $($in weeks$)$ for Activity D$.$

A$.7$

B$.6$

C$.9$

D$.5.$