Question

Circle D is shown. Line segment F E goes through point D. Line segment C D is shown. Line segment G H goes from one side of the circle to the other side. Line segment A B is outside of the circle and intersects the circle at point B.
In circle D, which is a secant?

EF
DC
Line segment A B
Line G H

Answer 1

GH.

A secant is a line (or segment) that intersects a circle in two points. GH passes through the circle entering and exiting (two intersection points). EF passes through the center D (it's a diameter), CD is a radius, and AB meets the circle at only one point (a tangent).