$($Competency $4$: Learning Objective $1)$ Kamal Company incurs both fixed and variable production costs. Assuming that production is within the relevant range, if volume goes up by $20\%,$ then the total costs would

$($A$)$ increase by $20\%$

remain the same

increase by an amount less than $20\%$

$($D$)$ decrease by $20\%$