SOLUTION: Is it A? I want to check my answers. Which two vertices are ADJACENT to each other? A. Vertex A and Vertex D B. Vertex D and Vertex E C. Vertex A and Vertex B D. Ver

Question 1160765: Is it A? I want to check my answers.
Which two vertices are ADJACENT to each other?
A. Vertex A and Vertex D
B. Vertex D and Vertex E
C. Vertex A and Vertex B
D. Vertex C and Vertex D

The graph for the question and the question itself are in the link here:

https://i.imgur.com/WxvoWOe.png
Found 2 solutions by ikleyn, jim_thompson5910:
Answer by ikleyn(52898) (Show Source): You can put this solution on YOUR website!
.

Option A.

Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!

Yes you are correct. Vertices A and D are connected with an edge (basically a line segment or some kind of curve), so they are adjacent vertices.

In contrast, vertices like D and E are not connected with an edge. If we wanted to go from D to E, or vice versa, then we must travel through at least one other vertex, which shows D and E are not next door neighbors.

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