A Sailboat Enthusiast Has Mounted a Battery-Operated Fan on His

Multiple Choice

A sailboat enthusiast has mounted a battery-operated fan on his boat to provide an air current for the sail. If the fan is pushing the air toward the right, straight on the sail,

A) the boat moves in the same direction as the air pushed by the fan.
B) the boat does not move.
C) the boat moves in the direction opposite to the air pushed by the fan.
D) more information is needed to work out the answer.