Given the Following EVENTS $($NODES$)$ and TIMES $($days$)$

$\backslash$table$[[$Activity$,$Start,Finish,OPTIMISTIC,MOST LIKELY$],[$A$,1,2,41,50],[$B$,1,3,54,60],[$C$,2,4,58,70],[$D$,3,4,32,41]]$

What is the estimated expected $($mean$)$ time for project completion?

$41$ days

$70$ days

$100$ days

$120$ days

$221$ days