Which of the Following Is a Possible "Contaminant" That Was

Multiple Choice

Which of the following is a possible "contaminant" that was not accounted for in the study of the tire market reported in the Evidence-Based Economics segment?

A) Towns in the study may be located near a large city.
B) The quality of tires sold in different towns may be different.
C) It may be harder to start a tire dealership in some towns than in others due to local business law.
D) The number of tire dealers is different from one town to another.