What does the red proofreading symbol indicate to the writer?

"the name pelé is nearly always associated with the game of soccer. although pelé stopped playing soccer, he remains a legend. becoming an ambassador for soccer, he worked to promote peace and understanding through sports. pelé was named fifa's "co-player of the century." in all, he scored 1,281 goals in 1,363 games of his career. nearly all soccer players are measured against pelé's legacy." which detail is an effective summary of this text? a. pelé scored over 1,000 goals in more than 1,000 games during his career. b. pelé was the best soccer player to ever live. c. pelé believed sports could promote peace and understanding among people. d. pelé was a legend in soccer for both his playing and his work in the sport after retirement.