Brian Was of Average Weight Throughout His Childhood and in College

Multiple Choice

Brian was of average weight throughout his childhood and in college. However, he has gained more than 30 pounds over the past 18 months and has become obese. Which of the following is most likely to be the cause of his obesity?

A) the decline in food prices in his region
B) the absence of physical activity in his daily routine
C) the lower availability of energy-saving devices
D) the decline in his mental health problems