In a certain city there is a river running through the middle of the city. There are three islands and seven bridges as shown in the figure below.
Suppose that there is a crossing charge of $1.00 every time one crosses a bridge. A tourist wants to start on the North Bank, stroll across each of the bridges at least once, and return to her hotel on the North Bank at the end of the trip. What is the cheapest possible cost of such a trip?
A. $7
B. $14
C. $8
D. Such a trip is impossible.
E. none of these
Answer: C
Mathematics
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