In the following question, two columns are given containing three phrases each. In the first column, phrases are A, B, and C, and in the second column, the phrases are D, E and F. 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 grammatically and contextually correct sentence. If, none of the options given forms a correct sentence after combination, select ‘None of these’ as your answer. 

Column (1)	Column (2)
(A) The climate was becoming milder,	(D)the availability of fish.
(B)Although periods of drying forced people south,	(E)they returned once their food supply was secure.
(C)Population growth along rivers and lakes was dramatically decreasing	(F) allowing for a greater variety of crops to be grown.