Which of the following explains the relationship between angles C and D?

Question

Which of the following explains the relationship between angles C and D?

1.  Adjacent angles 
2. Corresponding angles 
3. Complementary angles 
4. Vertical angles

Answer 1

(1) is the correct answer choice.

Angles C and D are complementary (sum to a right angle), not supplementary (sum to 180 degrees).

They are not vertical because they are not across from one another, but instead share a common edge.

They are not corresponding because no parallel lines are involved.

Instead they share a common vertex and a common edge (side).