PART A: Which statement best expresses the

central idea of the text?

A Halloween is the best time for behavioral

scientists to study differences between children

and adults.

B Food is a great tool for studying how people

make decisions because each person has a

favorite food.

C Halloween is the only time when behavioral

scientists can observe the choices that people

make.

D Behavioral scientists use Halloween to observe

how small changes affect the choices that people

make.