The two major geographic components of Southeast Asia are a. an extensive archipelago (today's Indonesia and the Philippines) and a mainland zone from the Malay Peninsula north to China. b. the Tienenman Valley and the Angkor Strait communities. c. the Sargasso Hills and the Red River plain. d. the Mekong Delta and the Cao Highlands.

Option-(A): An extensive archipelago (today's Indonesia and the Philippines) and a mainland zone from the Malay Peninsula north to China

Explanation:

While, each zone or region has its own set of features or more over the different cultures, languages, and history. But, there are some regions which are more of a different small parts of land or mainly series of islands that are administered by the specific set of people or parties inside the region. Like the Caribbeans inside the American region, there are islands inside the Southeast Asian territory which are however much larger in having more land mass as compared to that of inside the American region, as there is a diversity among the flora and fauna that the areas has in it.Along, with being the most attractive destination for tourists as well.

Alloy of metals is the answer