Correct option (d) Vietnam
Explanation:
The Mekong Delta is the region in southwestern Vietnam where the Mekong River approaches and empties into the sea through a network of distributaries. The Mekong–Ganga Cooperation (MGC) was established on November 10, 2000, at Vientiane, Laos at the First MGC Ministerial Meeting. It comprises six member countries, namely India (LookEast connectivity projects), Thailand, Myanmar, Cambodia, Laos and Vietnam.
