Option A) Point and line Option
B) Plane and line Option
C) Point and ray Option
D) Ray and line
Answer: The correct pair of undefined terms used to define the term “parallel lines” is Option B) Plane and line.
Explanations :
Parallel lines are defined as lines that lie in the same plane and do not intersect. A plane is a flat surface that extends infinitely in all directions. A line is a straight path that extends infinitely in both directions. Therefore, to define parallel lines, we need both the concept of a plane and a line.
Two lines are said to be parallel if they lie in the same plane and do not intersect, and this definition requires both the concepts of a plane and a line.