If the ship just avoids the dangerous area, the ship will travel in PQ direction at speed V.

As shown in the figure, v 1 is the water velocity,

Then the speed of the ship in still water should be at least v 2 =v 1 sinθ. θ.

Obviously, the minimum speed of the ship in still water is greater than v 2 when driving in other directions, such as PM driving at speed v'

Tanθ= 150 3 150 = 3，

Then the speed of the ship in still water is at least V 1 sin θ = 23 m/s, so B is correct and ACD is wrong;

So choose B.