Six-Year-Old Jack Has Recently Learned to Appreciate the Value of Money

Six-year-old Jack has recently learned to appreciate the value of money, so his father assigns him some simple housekeeping chores to be performed throughout the week. He tells Jack that completion of these chores will earn him an allowance of one dollar every Saturday. Jack rarely completes his chores. From an operant conditioning perspective, which one of the following is most likely to be the reason why Jack is not doing his chores?

A) There is a delay in reinforcement.
B) Reinforcement is not contingent on the desired response.
C) Money is rarely an effective reinforcer for people.
D) The "reinforcer" is presented before the response.