When David Green,Betty Sternberg,and Mark Lepper (1976)discontinued Rewards and Prizes,why

Multiple Choice

When David Green,Betty Sternberg,and Mark Lepper (1976) discontinued rewards and prizes,why did elementary school children spend less time playing math games? The children probably reasoned,

A) "If I no longer win prizes,why should I play with these games?"
B) "My teacher must not like the games,or she would offer prizes."
C) "The games must be good,or why would my teacher give me prizes?"
D) "If I work hard on my spelling,maybe I can win prizes."