The correct answer is A. guess.
The word “conjecture” means “a guess or supposition made on the basis of limited evidence.” In other words, it is an educated guess based on what we know. Our knowledge of the past is limited because we cannot go back in time and observe it firsthand. We can only rely on evidence that has been left behind, such as fossils, artifacts, and written records. This evidence is often incomplete and can be interpreted in different ways. As a result, our knowledge of the past is always provisional and subject to change.
The other options are incorrect because they do not accurately reflect the nature of our knowledge of the past. Option B, “position,” suggests that our knowledge of the past is certain or fixed. However, as we have seen, our knowledge of the past is always provisional and subject to change. Option C, “certainty,” is similar to option B in that it suggests that our knowledge of the past is absolute. However, this is not the case. Our knowledge of the past is always based on limited evidence and can be interpreted in different ways. Option D, “form,” suggests that our knowledge of the past is fixed or unchanging. However, as we have seen, our knowledge of the past is always provisional and subject to change.