Final answer:
The correct answer is 15 inches, based on the ADA guidelines, which specify that accessible alarm systems must be within reach for all individuals, including those with disabilities.
Step-by-step explanation:
An easily accessible alarm system, as per guidelines set by the Americans with Disabilities Act (ADA), should be installed such that all operating mechanisms are within 15 inches to 48 inches of the floor for adults. This allows individuals, including those in wheelchairs, to easily reach and operate them in case of an emergency. Therefore, the maximum installation height would be 48 inches from the ground, making the correct answer to the question option 2) 15 inches, as it's the only option that is less than 48 inches and greater than the minimum ADA reach range of 15 inches