单选题As a ship moves through the water，it causes a wake，which is also moving forward relative to the sea. In addition to a fore and aft motion，this wake also has a(n)（）.Adownward and inward flowBdownward and outward flowCupward and inward flowDupward and outward flow
单选题
As a ship moves through the water，it causes a wake，which is also moving forward relative to the sea. In addition to a fore and aft motion，this wake also has a(n)（）.
A
downward and inward flow
B
downward and outward flow
C
upward and inward flow
D
upward and outward flow
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