B, Wuhan is located in the middle reaches of the Yangtze River, and the north-south Beijing-Guangzhou railway passes through the city, which is both a railway hub and a water transport hub, which meets the meaning of the question;
C, Jinan is located on the beijing-shanghai railway line, and the railway traffic is convenient, but the waterway traffic is inconvenient, which does not meet the meaning of the question;
D Beijing is the largest railway transportation hub in China, but the water transportation in this city is inconvenient.
Therefore, choose: B.