An elevator starts at the first floor of a building with 3 passengers. At the second floor, 1 passenger leaves, and 4 passengers get on. At the third floor, 1 passenger leaves, and 3 passengers get on. At the sixth floor, 1 passenger leaves, and 2 passengers get on. The elevator then starts its journey back down the shaft. At the fifth floor, 1 passenger leaves. At the second floor, 2 passengers leave, and 3 get on. How many passengers are on the elevator when it reaches the first floor?
A. 4
B. 5
C. 9
D. 10

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I get 9

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