All of the following duties are duties of professional engineers and geoscientists to society except...

Among the listed duties of professional engineers and geoscientists to society, the duty to achieve maximum returns on investment for their employer (Option C) is least aligned with their societal obligations. The primary duties of professionals in these fields towards society include promoting public health and safety, environmental protection, and benefiting society at large. The focus on financial returns pertains more to organizational or business objectives rather than societal duties.