Which of the following lines could be considered the main idea of “Head Games?”

That means no cell phones, computer games, television, or even books for a few days.
They thought she was just hyper from the excitement of competing in her first-ever sailboat race.
Catherine ignored her aunt and uncle who were visiting.
Concussions used to be seen as just another part of childhood, particularly for kids active in sports.

The line that could be considered the main idea of "Head Games" among the given options is Concussions used to be seen as just another part of childhood, particularly for kids active in sports.

Head Games was a 1979 song released under the Atlantic Records label by Roy Thomas Baker, Mick Jones, and Ian MacDonald. The trio belonged to the British-American rock band named "Foreigner."

The song was crafted for the band by Lou Gramm and Mick Jones. "Head Games" teaches the importance of reducing the pace of our human activities. Its warnings relate to the probability of having head concussions, which, unfortunately, increases with having one incident.

A head concussion is a traumatic brain injury that is caused by a blow to the head.

Thus, head concussions should not be taken as the injury that can happen only to kids involved in active sports. It can also happen to people who are not kids and who may not necessarily be involved in sporting activities.

Read more about head concussions at https://brainly.com/question/1445399