A). They went to great lengths to ensure that their tombs would not be robbed.
Explanation:
As per the descriptions provided in the excerpt, it can be concluded that 'the pharaohs of ancient Egypt went to great lengths to ensure that their tombs would not be robbed.' To protect the tombs from being robbed, they were preserved inside the grand pyramids as they had an inner threat that if their tombs are robbed, their afterlife might be under threat. Thus, <u>option A</u> is the correct answer.
