John's Reservation Wage Is $10 Per Hour

John's reservation wage is $10 per hour. This means that

A) John will not supply labor in the market until he receives a wage of at least $10 per hour.
B) John will supply labor in the market at a wage of $10 and lower.
C) John will work 10 hours per day.
D) John will decrease the hours he works when his wage rate exceeds $10 per hour.