Which of the following factors is primarily responsible for the gradual spatial shift of the sugar industry from North India to South India?

Options:

• A: The availability of cheap labor and subsidized electricity in Southern states.
• B: The tropical climate of South India which yields higher sucrose content in sugarcane and a longer crushing season.
• C: The complete depletion of soil fertility in the Indo-Gangetic plains due to monoculture.
• D: The presence of cooperative sugar mills which are entirely funded by international agencies.

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