The Table Below Contains Information About a Firm's Marginal Revenue

The table below contains information about a firm's marginal revenue product of capital.
A)The firm should hire 3,000 units or, if fractional units are possible, less than 4,000 but more than 3,000 units.
B)The firm should hire 4,000 units or, if fractional units are possible, less than 5,000 but more than 4,000 units.
C)The firm should hire 5,000 units.
D)The firm should hire 6,000 units or, if fractional units are possible, less than 7,000 but more than 6,000 units.
E)The firm should hire 7,000 units or, if fractional units are possible, less than 6,000 but more than 7,000 units.