Step 1: Understanding the Quit India Movement.
The Quit India Movement, also known as the August Movement, was a call for immediate independence from British rule. It was launched by Mahatma Gandhi in 1942 in response to the British refusal to grant India independence during World War II.
Step 2: Location of the Movement's Launch.
The movement was formally launched at the Bombay session of the All India Congress Committee (AICC) in Mumbai (then Bombay) in August
1942. This is where the famous slogan "Do or Die" was coined.
Step 3: Conclusion.
Therefore, the correct answer is (B) Mumbai, where the Quit India Movement began.
Final Answer: Mumbai.