Janet Conducts a Study and Finds That, Similar to Previous

Multiple Choice

Janet conducts a study and finds that, similar to previous research, students by themselves worked harder than students in groups (a phenomenon known as social loafing) . In addition, she found that social loafing could be lessened if the students in the group knew each other well. Janet's study represents

A) replication.
B) replication with extension.
C) lack of control.
D) a synthetic study.