The correct answer is B) 61. The Fire Control Plan symbol 61 represents the direction of the primary means of escape, as per the symbols and legends used in the illustration D039SA. This symbol is specifically used to indicate the primary evacuation route or direction that should be followed in the event of an emergency. The other answer choices are incorrect because: A) 58 represents a fire extinguisher, C) 62 represents a fire alarm, and D) 63 represents a fire hydrant, none of which directly indicate the primary means of escape.