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.