The Quit India Movement was a significant event in the Indian freedom struggle. Option 1 states that it broke out in August 1942, which is correct. The movement was launched by Mahatma Gandhi and the Indian National Congress, demanding complete independence from British rule.

Option 2 states that Ahmedabad Textile Mills went on strike for more than three months, which is also correct. The textile workers played a crucial role in the movement, with many mills going on strike.

Option 3 states that the Muslim League and Hindu Mahasabha actively participated in the movement. This statement is incorrect. The Muslim League, under the leadership of Muhammad Ali Jinnah, did not actively participate in the Quit India Movement. Instead, they saw it as an opportunity to push for their demand for a separate nation, leading to the eventual creation of Pakistan. The Hindu Mahasabha, on the other hand, opposed the Quit India Movement.

Option 4 states that the Communist Party did not support the movement, which is correct. The Communist Party of India, under the influence of the Comintern, believed in supporting the British during World War II. They saw it as a way to strengthen the Soviet Union`s position against Nazi Germany.

In conclusion, the incorrect statement is option