Question $11(20$ points$)$

Balance the following line for an output rate of four pieces per hour. The times are in minutes $($not seconds$).$

$\backslash$table$[[$Work Element,Time $($min$),$Immediate Predecessor$($s$)],[$A$,7,-],[$B$,5,--],[$C$,3,--],[$D$,4,--],[$E$,2,$A$,$ B$],[$F$,5,$C$],[$G$,6,$D$],[$H$,7,$E$,$ F$],[$I$,11,$F$,$ G$],[$J$,4,$H$,$ I$],[,,]]$

The highest efficiency for a balanced line is:

A$)$ more than $89\%$ and less than $91\%.$

B$)$ less than $89\%.$

C$)$ more than $93\%.$

D$)$ more than $91\%$ and less than $93\%.$