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What refers to the distance between two sound frequencies or pitches?

In an article about americans working in middle eastern countries, cicy, a white journalist, is described as knowing that she should cover her hair when she leaves her house. according to this article, cicy:

Indian architects worked with construction techniques? a. concrete b. skeleton c. stone and wood d. post-and-lintel only answer if you are 100% positive your answer is correct! 10 points!