Your Neighbors Have Asked You to Look After Their Dog

Your neighbors have asked you to look after their dog while they are on vacation.It will take you one hour per day to feed,walk,and care for the dog,which you can do either before or after you go to work.Your regular job pays $10 per hour,and you can work for up to eight hours per day.The smallest amount of money you would accept to take this job is:

A) $10 per day,because that is your opportunity cost of one hour of work.
B) $15 per day,because overtime wages are generally equal to 1.5 times your regular wage when you work more than eight hours in one day.
C) zero,because your regular job is not available for the ninth hour of work.
D) the value of one hour of leisure,which is greater than zero.