Option 1: China - China is a member of the Greater Mekong Subregion (GMS) grouping. The GMS consists of six countries - Cambodia, China, Laos, Myanmar, Thailand, and Vietnam - all located in the Mekong River Basin.
Option 2: Malaysia - Malaysia is not a member of the Greater Mekong Subregion (GMS) grouping. Although Malaysia is geographically close to the GMS countries, it is not included in this particular regional cooperation initiative. Malaysia is not part of the Mekong River Basin and does not share borders with any GMS countries.
Option 3: Myanmar - Myanmar is a member of the Greater Mekong Subregion (GMS) grouping. Myanmar, along with other countries like Cambodia, Laos, Thailand, Vietnam, and China, is part of the initiative aimed at promoting economic cooperation and integration in the Mekong region.
Option 4: Thailand - Thailand is a member of the Greater Mekong Subregion (GMS) grouping. Thailand, along with other countries like Cambodia, Laos, Myanmar, Vietnam, and China, is part of the initiative aimed at promoting economic cooperation and development in the region.
Therefore, the correct answer is Option 2: Malaysia is