what is the effect on the contribution margin per unit and the contribution margin ratio?

$\backslash$table$[[$Contribution margin,Contribution,$],[$per unit,margin ratio,$],[$A$.,$No change,No change$],[$B$.,$Increase,Increase$],[$C$.,$Increase,No change$],[$D$.,$Increase,Decrease$]]$

Multiple Choice

Option A

Option B

Option C

Option D

Prey

$13$ of $22$

Notrt $>$

D$).$