The correct answer to this open question is the following.
Unfortunately, you did not attach the options for this question. Ther is not contexts, references, or text. So we assume that this is a general and open question.
So we can comment on the following general terms.
If Paulo is analyzing "The Grand Canyon of Arizona," he has to do research on the geography and other physical attributes of the area.
He has to define the type of research he needs. It could be about the land, it could be about the wildlife, it could be about the environment, the weather conditions, and so many other topics for research. Probably, he is interested in the sediment layers of the land that many scientists had concluded started on the Protoarozoic Era or the Paleozoic Era.
The Grand Canyon covers a large portion of land in the zone called the four points, a special place in the United States and a sacred place for the Native Indians tribes that live there. It is the corners of the stats of Utah, Colorado, New Mexico, and Arizona.
