10 points and brainliest is it A, B, C, D
Read the following passage and answer the question.

1. Athletes of any age can learn the signs of a concussion and reach out if they’re concerned they may have one. 2. Friends can also play an essential role. 3. Since it can be hard to identify a concussion in yourself, Covassin suggested that friends talk to coaches or parents when they see someone who has hit his or her head complain of dizziness or headaches, or act out of character.

Which of the above sentences is a topic sentence?

A. Sentence 1
B. Sentence 2
C. Sentence 3