Answer: B. They are one-dimensional objects
This applies to line segments and lines as well.
One dimensional objects are such that they only have one component to them when it comes to determining a location on that object.
For instance, a number line is one dimensional because we only need one number to determine where a location is.
A ray is effectively a half-line, or put another way, a line is the combination of two rays glued together. Basically a ray points forever in one direction only, as a line will point in two opposite directions.
Extra side notes:
- I can't think of any zero dimensional objects off the top of my head.
- 3D space is a 3 dimensional object because we need 3 coordinates to determine an exact location.
- A flat 2D plane is a 2 dimensional object because we need 2 coordinates to determine a location.
