question_answer

Compared to 50 years ago, the thinning ozone layer has produced dramatic increases in cases of:

1. asthma

2. color blindness

3. cataracts

4. skin cancer

Which of the above is/are correct?

A)  1 and 2          

B)  3 and 4

C)  1, 2 and 3                    

D)  All of these