Which of the following is correct concerning reactions to INCREASES in activity?

$\backslash$table$[[,$Total,Variable Cost$],[,$Variable Cost,Per Unit$],[$A$),$Increases,Decreases$],[$B$),$Constant,Decreases$],[$C$),$Decreases,Constant$],[$D$),$Increases,Constant$]]$

Choice A

Choice C

Choice B

Choice D