Miss Hattie's box of shame is - aside from likely being illegal - meant to serve as...

a. A positive incentive that is used to motivate the orphanage's girls to sell more cookies.
b. An input used in the production of cookies.
c. A negative incentive (disincentive) designed to encourage the girls to sell more cookies.
d. A positive incentive that will motivate the orphanage's girls to sell fewer cookies.