Dr Less Collected Data Showing That Depressed People Were Less

Multiple Choice

Dr. Less collected data showing that depressed people were less interested in interacting with non-depressed people. She concluded that their depression had caused them to withdraw from people. However, later research showed that depressed people had not interacted with non-depressed people even before they became depressed. Dr. Less failed to consider ___________ problems.

A) falsifiability
B) directionality
C) third-variable
D) internal validity