In the following question, two columns are given, containing three phrases each. A phrase from the first column may or may not connect with a phrase from the second column to make a grammatically and contextually correct sentence. There are five options, four of which display the sequence(s) in which the phrases can be joined to form a correct sentence. If none of the phrases make a correct sentence, mark ‘None of these’ as your answer.

Column 1	Column 2
A. If the hole which has opened up in the ozone layer extends further south over populated areas	D. harmful levels of ultraviolet radiation from the sun.
B. Low temperatures in the northern Polar Regions led to	E. people would be at increased risk of sunburn.
C. The ozone layer protects the earth from	F. an unusual stable polar vortex.