Mary Jane Is Willing to Baby-Sit for $6 an Hour

Mary Jane is willing to baby-sit for $6 an hour.Her neighbor called and asked her to baby-sit for $8 an hour.Mary Jane will earn:

A) consumer surplus of $2 per hour.
B) economic rent of $2 per hour.
C) economic profit of $8 per hour.
D) accounting profit of $8 per hour,but economic profit of $0 per hour.