In "the world system and colonialism," kottak argues that in the world system, the complexity of economic activities and the level of capital accumulation is the greatest in: a. core nations. b. periphery nations. c. semiperiphery nations. d. the capitalist world economy.

Option A

Explanation:

Core Nations:

These nations incorporate those countries which are strongest, technically advanced and most powerful countries.These nations also contribute to monopolize the activities with maximum profit and governs the finance of the world.These nations have the largest accumulation of the capital and most complex economic activities.

Semi-periphery Nations:

Transitional among periphery and core.Trade mechanical merchandise and items yet need control and monetary predominance of center.Contemporary countries of the semiperiphery are industrialized.  

Periphery Nation:

World's least advantaged and amazing nations. Produces crude materials, agrarian wares, and human work for fare to center and semi-periphery.   Some level of industrialization. Monetary exercises less motorized.

The Capitalist World Economy:

A solitary world framework focused on creation available to be purchased or trade, with the object of augmenting benefits, as opposed to providing residential needs.

Ithink it's a, but i might be wrong