PLS HELP. NO SCAM. NO LINKS. Read the passage.

Children today spend more time using computers, phones, and tablets than children did in the past. This means that youngsters tend to be less physically active now than before. At the same time, there has been an increasing awareness of the importance of exercise. Recent research has supported the idea that brain development and physical development go hand in hand. National Physical Activity Plan guidelines suggest that every young person engage in at least 60 minutes of physical activity a day.

What is the MAIN reason that the author mentions computers, phones, and tablets?
A. to explain that children spend much of their time using them instead of exercising
B. to trace the development of more and more complex electronic devices over time
C. to show that using them can encourage brain development in children
D. to describe how these devices have increased in popul