The author of theory" believes that the quipu was used as a calculator by the incas. which important detail supports that summary?

a. most of us do not do math without a calculator.

b. the knots in the dangling strings represented numbers.

c. quip is are made of cotton and wool strings.

d. the quipu knots represent letters.

the development of trade during the middle age increased to the change given in the agriculture, which gave money, industry and markets a bigger importance in economy. the agriculture production was more than the consumption, which meant the creation of wider markets out of the areas. besides, with the end of multiple wars, the population increased and new trade routes were created.

the answer is the speaker views both as possessions that reflect his importance.  

climax. is the answer