Lockard Company purchased machinery on January $1,2020$ for $$70,000.$ This machinery is estimated to have a salvage value of $$7,000$ after a useful life of $6$ years. What is the $2020$ depreciation expense using the sum$-$of$-$the$-$years'$-$digits method $1$

A$)10,500$

B$)14,000$

C$)18,000$

D$)20,000$