Question

Which segment below is a secant?

Answer 1

The secant of a circle is any line that intersects two points on the circumference of the circle. The appropriate answer would be line HJ

Answer 2

A secant is a line going through a circle once. It cannot go outside the circle, nor can it stop at the center of the circle. Its ends must extent past the circumference. This means line segment AB cannot be a secant, as it lies outside of the circle. Instead, it is the tangent: a line that touches the outside of the circle at one point and one point only. This also means OJ can't be the secant either, because it stops at the center of the circle, rather than going all the way through. OJ is the radius, the length from the outside to the center that reaches equally through any part of the circle. Since neither A nor C are correct, that means it's B, which works out because line HJ extends beyond both ends of the circle, and only goes through it once. 

I hope I helped!