Explanation:

- Option 1: Bangladesh

- India and Bangladesh have a longstanding relationship regarding waterways connectivity.

- They have multiple agreements to utilize rivers for trade and transportation.

- Recent agreements aim to enhance and streamline the existing waterway links between the two countries.

- Option 2: Pakistan

- India and Pakistan have tense bilateral relations, especially concerning transportation and transit agreements.

- No recent waterways pact between India and Pakistan has been reported.

- Option 3: Bhutan

- Bhutan is a landlocked country without direct access to significant waterways connecting it to India.

- Waterways pacts are less feasible due to geographical constraints.

- Option 4: Myanmar

- While there has been interest in enhancing connectivity with Myanmar, currently it does not involve a major waterways pact like India-Bangladesh.

Correct Answer: Option 1: Bangladesh