Given the following data about an assembly line and the knowledge that we are trying to attain an output rate of $40$ units per hour, what is the theoretical minimum number of stations?

$\backslash$table$[[$Work Element,Time $($sec$)],[1,90],[2,80],[3,75],[4,70],[5,90],[6,85]]$

A$)$ four or fewer stations

B$)$ five stations

C$)$ six stations

D$)$ seven or more stations