Answer:
Facundo is comparing the population distribution of the two states.
Step-by-step explanation:
Politics; is not correct because there isn't anything political that is mentioned or attributed in what Facundo is comparing and investigating.
Productivity display; is not correct because this is an economic metric, and Facundo doesn't have his focus on that.
Geomorphology; is not correct because this a science that is part of physical geography, thus it doesn't have anything to do with the human populations.
Population distribution; is correct because Facundo is comparing the populations of these two states, their densities, the area in which they live, thus his focus is on the population distribution.