A project manager has discovered that three tasks are on the critical path for a particular project. She has developed the time estimates $($in days$)$ shown in the table below. Complete the table and determine the expected completion time for the project.

$\backslash$table$[[$Task$,\backslash$table$[[$Best$],[$Case$]],\backslash$table$[[$Most$],[$Likely$]],\backslash$table$[[$Worst$],[$Case$]],\backslash$table$[[$Expected$],[$Duration$]],\backslash$table$[[$Standard$],[$Deviation$]],\backslash$table$[[$Standard$],[$Deviation$],[$Squared$]]],[$A$,5,8,14,,,],[$B$,2,4,9,,,],[$C$,3,5,7,,,]]$

A$.17$ days

B$.18$ days

C$.21$ days

D$.19$ days