Option (E) is correct because the textbook explicitly states that the Prime Minister decides who will be ministers in the Council of Ministers and allocates ranks and portfolios to them. The text clearly mentions: 'Depending upon the seniority and political importance, the ministers are given the ranks of cabinet minister, minister of State or deputy minister.' The phrase 'seniority and political importance' directly corresponds to 'political weight of the various aspirants' mentioned in option (E). The Prime Minister must consider the political standing and influence of potential ministers while forming the Council of Ministers. Options (A), (C), and (D) are not supported by the given context. Option (B) is also not fully accurate as the text mentions that Chief Ministers choose from their own party or coalition, but does not state this as an exclusive criterion for the Prime Minister's selection.