Final answer:
Mongolia and Tibet are part of East Asia, while Laos is located in Southeast Asia; Southeast Asia is the closest option provided.The correct option is B.
Step-by-step explanation:
Mongolia, Laos, and Tibet are located in Asia. Specifically, Mongolia is a landlocked country in East Asia, north of China and south of Russia, known for its vast, rugged expanses and nomadic culture. Laos is located in Southeast Asia, bounded by Thailand to the west, Vietnam to the east, Cambodia to the south, and China to the north. Tibet, historically a region and now mostly encompassed by the Tibet Autonomous Region of China, is located in East Asia, on the northern side of the Himalayas. Therefore, the answer to the student's question is B) Southeast Asia for Laos, while Mongolia and Tibet are more accurately described as part of East Asia. However, if only one answer must be chosen from the provided options, B) Southeast Asia is the closest, with the understanding that it is not entirely correct for all three locations.