$\backslash$table$[[$Price$,\backslash$table$[[$Quantity$],[$Supplied$]],\backslash$table$[[$Quantity$],[$Supplied$]],\backslash$table$[[$Quantity$],[$Supplied$]]],[$$$0,0,0,0],[$$$3,2,4,6],[$$$6,4,12,12],[$$$9,6,16,24],[$$$12,8,20,30]]$

Refer to Table $4-8.$ If these are the only three sellers in the market, then the market quantity supplied at a price of $$6$ is

$12$ units.

$6$ units.

$24$ units.

$18$ units.