Derrick Designed an Experiment in Which Participants Listened to a Persuasive

Derrick designed an experiment in which participants listened to a persuasive speech delivered either by a person who was very tall or a person who was average in height.In addition,the speeches were delivered either by individuals wearing business clothes or by people wearing casual clothes.In this example,Derrick

A) has two dependent variables, and will be able to determine if persuasion interacts with any other factors.
B) has two independent variables, and will be able to determine if height and style of clothing interact.
C) does not have a control group, which should reduce the impact of self-reporting bias in his study.
D) is using a double-blind procedure, which should reduce experimenter bias.