In an Experiment on the Effects of Room Color on Mood,the

Multiple Choice

In an experiment on the effects of room color on mood,the participants in the pink room condition are asked to read a boring computer manual,while the participants in the bright blue room are asked to read a section from a romance novel.Their mood is then measured.This study lacks ________ because of ________.

A) generalizability; a systematic characteristic
B) external validity; the independent variable
C) generalizability; demand characteristics
D) internal validity; a confound