Choice "D" is correct. Maintaining safe (mandated by regulation) carbon dioxide emissions during production is a compliance objective. Compliance objectives include adherence to the laws, rules, and regulations associated with operations, including environmental regulations and other laws.Choice "c" is incorrect. Maintaining adequate staffing to keep overtime expense within budget is likely an operations rather than compliance objective.Choice "b" is incorrect. Maintaining material price variances within published guidelines is likely an operations objective.Choice "a" is incorrect. Maintaining accounting principles that conform to GAAP is likely a reporting objective.