The following data have been collected for four different cost items.

$\backslash$table$[[,$Cost at$],[$Cost$,100,$Cost at$,,],[$Item$,$units,$140$ units,,$],[$W$,$$$8,000,$$$10,560,,],[$X$,$$$5,000,$$$5,000,,],[$Y$,$$$6,500,$$$9,100,,],[$Z$,$$$6,700,$$$8,580,,]]$

Which of the following classifications of these cost items by cost behavior is correct?

$\backslash$table$[[,$Cost W$,$Cost $x,$Cost Y$,$Cost Z$],[$A$),$variable,fixed,mixed,variable$],[$B$),$mixed,fixed,variable,mixed$],[$C$),$variable,fixed,variable,variable$],[$D$),$mixed,fixed,mixed,mixed$]]$

Multiple Choice

Choice A

Choice B