DrGaronski Is Testing His Hypothesis That People Use Hand Gestures

Dr.Garonski is testing his hypothesis that people use hand gestures more in communication when emotionally aroused than when clam.When his results were reviewed,it was noted that Dr.Garonski sometimes missed seeing small gestures in the calm condition.This is an example of

A) conjunctive fallacy.
B) confirmation bias.
C) attribution error.
D) a single-variable explanation.