Which of the following is true according to the passage?

A. People will all become short-sighted after they begin to go to school.

B. Playing outdoors for 2 or 3 hours every day can help protect your eyesight.

C. Children in Australia are more likely to get short-sighted than those in Singapore.

D. If you spend two or three hours playing outside each day, you won’t get short- sighted.