Review the main idea. the workforce for egyptian pyramids was highly specialized. which detail best supports the main idea? (a) the construction of the pyramids was a huge accomplishment (b) experts today estimate that 20,000 - 30,000 laborers worked on the pyramid at one time. (c) whichever space ramp was used, egyptian workers toiled extremely hard. (d) it was divided into groups that had specific tasks: raising a wall, building the roof of a burial chamber, and so on