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) __________.

Correct Answer: Option B — upward and inward flow

As a vessel moves, the water displaced by the hull must flow around it to fill the void created at the stern. This results in a wake pattern characterized by an upward and inward flow toward the propeller disc, which must be accounted for when calculating propeller efficiency and thrust.