Answer:
Option A is correct.
A linear pair of angles whose measure sum to 180 degree and share a common ray
Explanation:
Linear pair of angles states that it is formed when two lines intersect as shown in the figure given below,
Two angles are said to be linear pair of angles if they are adjacent angles formed by two intersecting lines.
Then, the measure of a straight angle is 180 degrees, so a linear pair of angles must add up to 180 degrees.
Therefore, A linear pair of angles whose measure sum to 180 degree and share a common ray.