Consider the Observation That People Who Eat an Apple Each

Multiple Choice

Consider the observation that people who eat an apple each day have fewer visits to a doctor. Which of the following would represent the third variable that explains the negative correlation in this statement?

A) The high levels of vitamins in apples
B) The overall more nutritious diets of people who regularly consume apples
C) The ages of the apple eaters
D) The types of apples consumed