Answer:
Option: A is the correct answer.
A.) A line extends indefinitely in both directions.
Explanation:
A line is a straight pat that passes through the infinite points which are collinear. (A line is as wide as a point, infinitely thin, having an infinite number of points, ( so usually we would simply draw a line (with thickness!) with an arrow on both ends )
A line with the arrow heads on both direction represents a line goes infinite direction in both the directions.
Hence, option A is correct.
A.) A line extends indefinitely in both directions.