20 points, .
review the main idea. the task of building the pyramid obviously required a huge workforce. which detail best supports the main idea?

the construction of the pyramids was a huge accomplishment.

experts today estimate that 20,000-30,000 laborers worked on the pyramid at any one time.

whichever shape ramp was used, the egyptian workers toiled extremely hard.

large work crews were divided into smaller ones called phyles, which in turn were divided into teams of 10 or 20 (morell 88-89).

Experts today estimate that 20,000-30,000 laborers worked on the pyramid at any one time.  

Explanation:

The main idea about the enormous labor force required to build the pyramid is appropriately supported by the number of workers that specialists believe were employed to construct it.

The rest of the choices are incorrect because they do not provide evidence for or make reference to the number of personnel demanded to erect the pyramid. Option one is too general, alternative three mentions shape ramps not included in the main idea, and choice four details how work crews were arranged.

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