Which of the Following Clues Would the Steepness of a Slope

Which of the following clues would the steepness of a slope, by itself, be most directly able to provide to a geographer in understanding a place?

A) It suggests the ethnicity of human settlement may have lived on the slope.
B) It suggests the type of rock that might be present to form soils.
C) It suggests how far the location is from the equator.
D) It suggests the strength of the wind at the location.