Ir the ampunt of sales remains constant, the conintsution margin ratio always decreases when:

A$)$ The variable expense ratio increases

B$)$ The variable expenve natio decreases

C$)$ Fhed expenses incrvaise

D$)$ Fived expenses decrease

The following information was taken from the accounting records of Theta inc:

$\backslash$table$[[$Sales revenue,$$20,000$