The precise definition of the figure described as "a straight figure that has no thickness and extends infinitely in two opposite directions" is:
a straight line.
So, the correct option from your list is:
- a straight line that always remains the same distance from another line and, therefore, never intersects it (this describes parallel lines, not a straight line).
The exact option you're looking for seems to be missing from your list if we're strictly adhering to the definition of a straight line. If you meant the definition of a straight line, it's typically not explicitly stated in the choices you provided.