According to NFPA 101, Life Safety Code, emergency egress and relocation drills are mandated in business occupancies under specific conditions. Drills must be conducted at least annually if the total building occupant load is 500 or more persons. Alternatively, drills are also required if there are more than 100 persons located either above or below the street level. This requirement ensures that occupants in potentially more hazardous locations, such as high-rise floors or basements, are prepared for an emergency evacuation or relocation.

B. 150: This number is not the specified occupant load threshold for requiring fire drills in business occupancies per NFPA 101.

C. 200: This is an incorrect value; the NFPA 101 threshold for occupants above or below street level is explicitly set at 100.

D. 250: This value does not correspond to the occupant load criteria for fire drills in business occupancies as defined by the Life Safety Code.

1. NFPA 101®, Life Safety Code®, 2021 Edition.

Section 38.7.4.2 (New Business Occupancies): "Emergency egress and relocation drills shall be required in business occupancies where the occupant load is 500 or more persons or more than 100 persons are located above or below the street level."

Section 39.7.4.2 (Existing Business Occupancies): "Emergency egress and relocation drills shall be required in business occupancies where the occupant load is 500 or more persons or more than 100 persons are located above or below the street level."