Southeast asia is a. usually cold throughout the year b. completely landlocked c. primarily a desert d. divided into mainland and island countries

ANSWER:

Southeast Asia is divided into main and island countries.

EXPLANATION:

Mainland is known and considered as the 'greater part' of the land which make a 'country or territory'. Islands are a land which are small in size and are present in the 'middle of the ocean'. So, countries which are located at the southeast side of Asia consist of mainland and islands. There are of total '11 countries' located in Southeast Asia.