Why did British India partition in 1947?

Out of all the sources used, these two sources are required to use. There are e-books online for both.
Khan, Yasmin. The Great Partition: The Making of India and Pakistan (2008).Pandey, Gyanendra. Remembering Partition: Violence, Nationalism and History in India (2001 ).
This is what the outline of the essay should look like:
SECTION I
Thesis: The partition of British India in 1947 became inevitable after the 1946 Calcutta riots because of Hindu-Muslim violence which stemmed from communalism and political extremism.Intro #1: Explain what the Calcutta Riots of 1947 was and its relevance.Intro #2: Transition into the Partition of Bengal and its relevance.
SECTION II
Body Paragraph 1: Introduce communalism and the cow protection movement; how did it lead to hindu-muslim conflict?Body Paragraph 2: How did hindu communalism turn into hindu nationalism? IBody Paragraph 3: How did these two things ultimately lead to the Calcutta riots?
SECTION III
Body Paragraph 1: What relationship did Ghandi and Jinnah have and how did it lead to political extremism?Body Paragraph 2: What was the conflict between the Muslim league and the Congress?Body Paragrpah 3: How did these two things ultimately lead to the Calcutta riots?
SECTION IV
Counter-argument paragraph: People argue that muslims need for representation is what led to the partition.
Rebuttal: The Congress nationalist project should not be assumed a Muslim political project.