In 2007,Congress Passed a New National Minimum Wage of $5

In 2007,Congress passed a new national minimum wage of $5.85.Which of the following is true?

A) The state of Delaware must make the state's minimum wage exactly $5.85.
B) The State of Delaware may enact a minimum wage of $5.75 if it is only applied to Delaware citizens working within the State of Delaware.
C) The State of Delaware may enact a minimum wage of $6.00 but only after receiving express permission from Congress.
D) The State of Delaware may enact a minimum wage of $6.00 unilaterally and without permission.
E) Congress may not enact any laws that interfere with a state's right to govern its own citizens so the law will be declared unconstitutional once challenged.