Answer:
∠a and ∠b are the adjacent angles.
Therefore, option D i.e. adjacent is the correct option.
Explanation:
Given the angles
We know that the two angles are termed as the adjacent angles when they share the:
From the given diagram, we are given the angles ∠a and ∠b.
It is clear that angles ∠a and ∠b have a common vertex and common side.
Therefore, the relationship between the angles ∠a and ∠b is 'adjacent'.
In other words, ∠a and ∠b are the adjacent angles.
Please note that the given relation can not be a 'linear pair' because the sum of two angles is NOT a straight line or 180°.
Therefore, option D i.e. adjacent is the correct option.