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.
B maybe i’m not sure though
The last answer sets the most formal tone; "Hello! I was very pleased to meet you at the party last week." the rest are very casual.
Is this a riddle, if so, my answer is Racecar.
