Solve the problem.Assume that G is a graph with no loops or multiple edges. Which of the following graphs G are definitely trees?
A. G has 14 vertices, 13 edges, and no circuits.
B. G has 14 vertices and there is exactly one path from any vertex to any other vertex.
C. G has 14 vertices, is connected, and every edge in G is a bridge.
D. all of these are trees.
E. none of these are trees.
Answer: D
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