Alberts Incorporated planned to use materials of $$9$ per unit but actually used materials of $$14$ per unit and planned to make $1,640$ units but actually made $1,770$ units.

The sales$-$volume variance for materials is

A$.$ $$1,820$ unfavorable

B$.$ $$1,170$ favorable

C$.$ $$1,820$ favorable

D$.$ $$1,170$ unfavorable