Answer:
D) Most Southeast Asian countries are considered to be part of the periphery because of the dominance of the secondary economic sector.
Step-by-step explanation:
The secondary economic sector, also known as the industrial sector, includes activities such as manufacturing, construction, and mining. It is a key driver of economic growth and development in most Southeast Asian countries, including Indonesia, Malaysia, Thailand, and Vietnam. This dominance of the secondary economic sector is a characteristic of peripheral economies, which are typically less developed than core economies and have a greater dependence on exporting natural resources and manufactured goods.