"Football is still the most popular sport in the U.S. Nearly 40% of adults name it as their favorite. In 2018, the Super Bowl audience was five times larger than that for the NBA Finals. But America’s love affair with football is starting to fade away. Public approval of the National Football League is down ten points in the last five years. Recent polls show that for the first time, a majority of parents say they would try and talk their children out of playing the game if they asked about joining a team. Researchers suggest several possible causes for the decline, including disapproval of the on- and off-field behavior of professional players, concern over the physical and mental damage of the game at all levels of play, and a more general drop in sports viewership of all kinds. Whatever the cause, these trends are still new. Only time will tell if America and football are headed for a break-up or a make-up."

The main idea of the reading is that football is losing popularity in the U.S. Which of the sentences below provides supporting details for that idea?