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)Runoff channels are found	(D) activity was occurring on the northern plains.
(B)They bear a strong resemblance to river	(E) systems on Earth.
(C) They formed at around the same time that volcanic	(F) in the southern highlands.