Read the passage.

(1) It is important to understand how necessary it is to participate in a sport. (2) The American Pediatrics Association notes that teens who participate in organized sports have better heart rates and lower instances of illness than teens who do not play a sport (Fredrickson 2018). (3) Teens who play a sport report having better grades and better management. (4) Sports can also help improve teens’ confidence and self-worth.

How does the in-text citation in sentence 2 support the thesis of the passage?

by explaining why teens need regular exercise and a healthy diet
by suggesting a resource for information about healthy teen heart rates
by including additional information about why teens like to participate in sports
by providing a way to confirm that this fact about teen heart rates and exercise is accurate