Why the other options are wrong:

• formed by natural geological processes.: The report describes people constructing the pyramids, not natural geological processes.
• built without any human workers.: Thousands of human workers are described, so construction without people is contradicted.
• built by slaves.: The report explicitly rejects the claim that the builders were slaves.

Correct Answer: every three months.

Why this is correct: The report explicitly says workers were rotated every three months. This is the rotation interval, not the total construction time or each worker's total service.

Why the other options are wrong:

• only once during the entire project.: The report describes an ongoing three-month rotation rather than one rotation for the whole project.
• every day without a break.: The stated interval is three months, not every day; no absence of breaks is reported.
• only after all pyramids were finished.: The rotations occurred during the work, not only after all pyramids were finished.

Correct Answer: they were buried near the king's grave.

Why this is correct: The archaeologists point to the workers' tombs beside the king's pyramid as evidence that they were not slaves. Burial close to the king is the particular evidence cited.

Why the other options are wrong:

• their graves were built on the mound.: A mound is not the location used in the archaeologists' argument. They emphasize the tombs beside the king's pyramid.
• their graves had ornamental stones.: The report does not cite ornamental stones as evidence of the workers' status.
• their graves had food.: Food in the graves is not the evidence cited. The cattle and sheep figures concern the workers' daily diet, not objects in their tombs.

Correct Answer: cattle and sheep.

Why this is correct: The archaeological evidence says the workers ate 21 cattle and 23 sheep a day. These are the two food animals specifically identified.

Why the other options are wrong:

• only local vegetables and fruits.: Cattle and sheep contradict a diet consisting only of vegetables and fruit.
• cereals and milk.: Cereals and milk are not the foods identified by this evidence.
• wine and meat.: Meat is supported, but wine is not stated; cattle and sheep is the fully supported pair.

Correct Answer: conical structures made from mud brick.

Why this is correct: The report says workers' tombs were usually conical and made from mud brick. Both shape and material match.

Why the other options are wrong:

• flat structures made entirely of wood.: The reported structures are conical mud-brick tombs, not flat wooden ones.
• underground chambers lined with metal.: Metal-lined underground chambers are not described; conical mud-brick tombs are.
• round structures made from stone.: Stone is not the material stated. The report describes conical tombs made from mud brick.