MajorNet Systems is a start$-$up company that makes connectors for high$-$speed Internet connections. The company has budgeted variable costs of $$145$ for each connector and fixed costs of $$7,500$ per month. MajorNet's static budget predicted production and sales of $100$ connectors in August, but the company actually produced and sold only $84$ connectors at a total cost of $$21,000.$

MajorNet's total flexible budget cost for $84$ connectors per month is

A$.$ $$14,500.$

B$.$ $$12,180.$

C$.$ $$19,680.$

D$.$ $$21,000.$