Question

The following question has the second sentence missing. Choose the appropriate alternative to complete it.

A The ozone layer protects us from the harmful UV rays of the Sun.
B _____________________________________________________
C The ozone layer is decreasing due to gasses called chlorofluro-carbons.

• A. The ozone layer is a thin layer.
• B. The UV rays cause skin cancer.
• C. Other layers of atmosphere are stratosphere and troposphere
• D. The Sun also gives us heat.

Answer 1

Answer: (A)

The ozone layer is a thin layer.

Here, option A connects A and C most coherently: all three sentences discuss the ozone layer. The other choices do not serve the same purpose as A. So, A is the answer.