Answer:
B: Experts today estimate that 20,000- 30,000 laborers worked on the pyramid at any one time.
Explanation:
The main idea about the task of builting the pyramid, which required a huge workforce, is supported by the detail described in option B that says that the experts estimate the number of workers involved in this colossal project: <em>between 20,000 and 30,000 laborers is to be considered a huge workforce.</em>
Wrokforce: all the people who work for a company or organization.
When working with a partner it is important to com prepared and actively listen.
Since this is specifically about working with a partner, the answer should be something unique to having a partner, listening is something that comes into play only when you have a partner.
The third one because the statement is mostly an opinion. Hope this helps.
