A demand curve that shifts to the left indicates

Shift of the demand curve to the right indicates an increase in demand at whatever price because a factor, such as consumer trend or taste, has risen for it. Conversely, a shift to the left displays a decrease in demand at whatever price because another factor, such as number of buyers, has slumped.

Explanation:

the correct answer is a) egypt and china.

egypt and china are two of the world’s oldest civilizations known by man. both ancient empires have left a great historic and cultural legacy to the world through archeology. both civilzations developed complex social relations, had deep religious beliefs, had dominion of agriculture and left writing records to understand their customs and culture.

among the requirements to consider a civilization, we find urbanization, writing records, a place of residence, agriculture methods, technological specialization, means of transportation, currency, population density, social stratification, and political integration.