Hogwarts is the only firm hiring teachers. The labor supply of wizardry teachers is given in the market shown here. Wage (per day) Quantity of labor supplied \[\$300\] \[0\] \[\$400\] \[1\] \[\$500\] \[2\] \[\$600\] \[3\] \[\$700\] \[4\] What is the marginal factor cost of the second unit of labor? Choose 1 answer: Choose 1 answer: (Choice A) \[\$800\] A \[\$800\] (Choice B) \[\$600\] B \[\$600\] (Choice C) \[\$400\] C \[\$400\] (Choice D) \[\$500\] D \[\$500\] (Choice E) \[\$1000\] E \[\$1000\]