$\backslash$table$[[\backslash$table$[[$Quantity$],[$of Workers$]],\backslash$table$[[$Total$],[$Product$]],\backslash$table$[[$Marginal$],[$Physical Product$]],\backslash$table$[[$Marginal$],[$Revenue Product$]]],[0,0,-,],[1,7,,],[2,18,,],[3,30,,],[4,40,,],[5,48,,]]$

In the above table, if this is a perfectly competitive firm and the market price of the product is $$5$ and the marginal factor cost of labor is $$60,$ how many units of labor will the firm hire?

Select one:

a$.3$

b$.6$

c$.2$

d$.4$