The correct answer is C) 2. Based on the illustration D038SA, which shows a vessel's fire control plan, there are 2 spaces protected by a fixed CO2 extinguishing system - the engine room and the generator room. This is evident from the symbols on the plan indicating the locations of the CO2 system. The other answer choices are incorrect because 4 spaces (A) is too many, 3 spaces (B) is too many, and 1 space (D) is too few compared to what is clearly shown on the fire control plan illustration.