According to the Law of Effect, in which scenario is the behavior likely to be repeated as a result of the reward?

a
An employee is promised a bonus when he leaves his job for each quarter during which he has the most sales.

b
An employee is promised a bonus at the end of the year if he has the most sales for the first quarter.

c
An employee receives a bonus at the end of the quarter for having the most sales for
week one in the quarter.

d
An employee receives a bonus at the end of the week for having the most sales that week.