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) What is outstanding about whales	(D) they are just like human beings.
(B)  While all mammals sleep	(E)  because they may drown.
(C) Whales are mammals, so in many ways	(F) is the way they can sleep.