Which sentence BEST explains the central idea of the text?
A
Smartphones are harmful when used excessively by children, who are more easily distracted and less disciplined than adults.
B
Smartphones make highway navigation easier, but they also increase the danger caused by driver inattention.
C
Smartphones may have many conveniences, but the reality is that they are proving detrimental to our social skills.
D
Although smartphones are helpful in many ways, we should take a close look at the downside of our dependence on them.
D
Although smartphones are helpful in many ways, we should take a close look at the downside of our dependence on them.