Answer:
[tex]\boxed{\tt A. \angle8 \ and \angle 7}[/tex]
Step-by-step explanation:
Supplementary angles are angles that add to 180 degrees.
Let's examine the answer choices.
A. ∠8 and ∠7
⇒ These angles are on a straight line together, so they are supplementary.
B. ∠5 and ∠1
⇒ These angles have no relation to each other. They are on different lines that are not parallel.
C. ∠7 and ∠4
⇒These angles also have no relation to each other.
D. ∠2 and ∠4
⇒ These angles are vertical, but not supplementary.
The correct answer is A. ∠8 and ∠7
