Comprehensive and Detailed Step-by-Step Explanation:
Storage of Class 2 Oxidizers:
Per NFPA 430 (Code for the Storage of Liquid and Solid Oxidizers), Section 6.3.4, in nonsprinklered retail sales areas open to the public, Class 2 oxidizers must not be stored at heights exceeding 5 feet (1.5 meters).
Why 5 Feet is the Limit:
Limiting the height reduces the risk of spills, accidental damage, and fire spread in a retail environment.
Other Options Explained:
Option A (3 ft): Too restrictive; NFPA allows up to 5 ft.
Option C (6 ft) and Option D (12 ft): Exceed the maximum permitted height for nonsprinklered areas.
Summary:
The maximum height for stored Class 2 oxidizers in a nonsprinklered retail area open to the public is 5 feet (1.5 meters).