In a certain city there is a river running through the middle of the city. There are three islands and nine bridges as shown in the figure below.
A graph that appropriately models this situation would have
A. 9 vertices and 5 edges.
B. 5 vertices and 9 edges.
C. 3 vertices and 9 edges.
D. 9 vertices and 3 edges.
E. none of these
Answer: B
Mathematics
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