Why is my math ACT so low?

ColumbianX
Tue, 31 Jan 2012 20:32:11 +0000

In a 3-dimensional (x, y, z) space, the set of all points
5 units from the x-axis is:

A. a line.
B. 2 parallel lines.
C. a circle.
D. a sphere.
E. a cylinder.

What is the answer?