Southeast asia is

a. usually cold throughout the year

b. completely landlocked

c. primarily a desert

d. divided into mainland and island countries

The answer is D.

Explanation:

Southeast Asia consists of eleven countries that reach from eastern India to China, and is generally divided into “mainland” and “island” zones. The mainland (Burma, Thailand, Laos, Cambodia, and Vietnam) is actually an extension of the Asian continent.

The Correct answer is D. divided into mainland and island countries

Hope this helps!