Is it true or false the southeast Asia consist of a mainland in insular areas

Southeast Asia, vast region of Asia situated east of the Indian subcontinent and south of China. It consists of two dissimilar portions: a continental projection (commonly called mainland Southeast Asia) and a string of archipelagoes to the south and east of the mainland (insular Southeast Asia).

Explanation:

if you tell me the video, i may be able to answer your question.

the answer would be a)henry grady because he came up with the term "new south"