The correct answer is: The boat moves in the same direction in which the air blows.
The fan attached to the boat will blow air in a certain direction. The sails of the boat will catch the wind and create thrust, which will cause the boat to move in the same direction as the air is blowing.
Option A is incorrect because the boat will not move in the opposite direction of the air flow. The sails of the boat will catch the wind and create thrust, which will cause the boat to move in the same direction as the air is blowing.
Option B is incorrect because the boat will not remain stationary. The fan attached to the boat will blow air in a certain direction, and the sails of the boat will catch the wind and create thrust, which will cause the boat to move in the same direction as the air is blowing.
Option C is incorrect because the boat will not move in the opposite direction of the air flow. The sails of the boat will catch the wind and create thrust, which will cause the boat to move in the same direction as the air is blowing.
Option D is incorrect because the boat will not spin around. The fan attached to the boat will blow air in a certain direction, and the sails of the boat will catch the wind and create thrust, which will cause the boat to move in the same direction as the air is blowing.