Final answer:
Urinals must be installed at least 12 inches apart from each other for privacy and to adhere to plumbing codes.
Step-by-step explanation:
Urinals should be installed a minimum of 12 inches from each other, making option A (12 inches) the correct answer. This spacing ensures privacy and comfort while providing enough room to comply with plumbing codes. In some instances, more space may be preferred for additional privacy or to meet the requirements of specific building codes.