Explanation:

- The Quit India Movement, a significant milestone in India's struggle for independence, was indeed launched by Mahatma Gandhi.

- This movement took place on August 8, 1942, during a session of the All India Congress Committee.

- Karachi, located in present-day Pakistan, was not the launch site for this movement.

- Madras, now known as Chennai, wasn't the city where this historical event began either.

- Lahore, also part of present-day Pakistan, does not relate to the launch of the Quit India Movement.

- Bombay, now Mumbai, is the correct city where the Quit India Movement was launched. It served as the backdrop for Gandhi's call for "Do or Die" in the battle for freedom.