Which of the following countries continues to have agricultural activities dominate its national income?

Cambodia.

Explanation:

The country is located in the southern part of the indo china and is a peninsular of the southeast ais and is about 181,035 km square in area and is bordered by the Laos, Vietnam and is the fastest-growing economies of the Asia and has a climate dominated by the monsoon and is thus dry and wet through the years. Most of the rural household depends on the agriculture sector and it's the mainstay of the economy and has 90% of the GDP and has 80% of the world force.

81 is a composite number