Question

what term describes plutos 17.1° tilt relative to this main plane?
a inclination: the angle between a planets orbital plane and the solar systems common plane
b eccentricity: how elliptical or stretched out an orbit is
c perihelion: the point in an orbit closest to the sun
d obliquity: the tilt of a bodys rotational axis

Explanation:

The question is about identifying the term that describes Pluto's tilt. The key is to match the definition (tilt relative to a main plane) with the correct term. Inclination refers to the angle between a body's orbital plane and a reference plane (like the solar system's common plane). Obliguity is about the tilt of a body's rotational axis (not orbital plane as in the question). Perihelion is a point in orbit. Eccentricity is about orbit shape. So, inclination is the right fit.

Answer:

A. Inclination: The angle between a planet's orbital plane and the solar system's common plane