Cantilever retaining walls can safely be used for a height not more than July 29, 2021 by admin Question: Cantilever retaining walls can safely be used for a height not more than A. 3 m B. 4 m C. 5 m D. 6 m Answer» d. 6 m Note: The above multiple-choice question is for all general and Competitive Exams in India.