Explanation:

- The Government of Puducherry announced a ban on the production, sale, and use of single-use plastic products starting from March 1, 2019. Correct Answer

- Delhi has also implemented measures to reduce plastic use, but the mentioned specific ban began in Puducherry in 2019.

- Maharashtra was the first Indian state to enforce a broad ban on single-use plastics, starting in June 2018, which was earlier than the date in the question.

- Goa, similar to other states, has taken steps to combat plastic use, but the specific date and initiative apply to Puducherry.