Standpipe systems are used in buildings over _____ in height, since that is the practical limit for firefighters to couple hose together from the pump truck at street level up the stairways to the fire floor.
a. 2 stories (12 m)
b. 3 stories (14 m)
c. 5 stories (25 m)
d. 10 stories (50 m)
e. 15 stories (75 m).
Answer: B