Question

in one-point perspective, what is the line called that separates the ground and the sky? (1 point) vanishing line orthogonal line horizon line mason-dixon line

Explanation:

In one - point perspective, the line that separates the ground and the sky is the horizon line. The vanishing line is related to the vanishing point of parallel lines, an orthogonal line is a line perpendicular to another (like the lines going to the vanishing point in perspective), and the Mason - Dixon line is a historical boundary between US states, not related to perspective drawing.

Answer:

C. horizon line