In the following question, two columns are given containing three phrases each. The phrases are labelled A, B, and C in the first column and P, Q, and R in the second column. A phrase from the first column may or may not connect with a phrase in the second column to make a grammatically and contextually meaningful sentence. Identify the correct option given below that gives the correct sequence in which one or more sentences can be formed. If none of the options makes it possible for a meaningful sentence to be formed, indicate 'None of these' as your answer.

Column 1	Column 2
(A) Studies of the coronavirus are largely	(P) focusing on its ‘spike’ protein
(B) This is a complex question to which there is,	(Q) so far, no clear answer.
(C) The judgment declared	(R) the Maratha reservation unconstitutional