Which of the following questions about the past cannot be answered by studying artifacts? What materials were available to the people?
How did the people of the culture live?
What items did the people of the culture value?
What was the population density of the region?

What was the population density of the region.

Explanation:

In process of elimination, the materials available are the ones that are found. The items found also show how the people lived, were they rich or poor? The items found can also show what the people valued, how many of these items were found? Were they found in protective casings or close to people's homes? The population density is harder to find based only on artifacts and is therefore the least likely.

D

Explanation:

They can not count the exact number of people that were there because only they would know from back then

D is What was the population density of the region? which is the answer

the passage of a strict fugitive slave law