Which of the following statements regarding total exit capacity is MOST accurate?

A. Procedures for determining exit capacity are uniform regardless of level of exit.
B. The total of exit capacities cannot be less than the sum of all the capacities.
C. To calculate exit capacity, determine the capacity of each exit and subtract the lowest number from the highest.
D. Stairways must be able to accommodate the greatest number of people expected to occupy all floors above.

B