Civil Engineering: Which parameter is most critical when assessing the efficiency of activated teak leaves and banana trunk for wastewater treatment, considering their application in civil engineering projects?

A$)$ The aesthetic appeal of using natural materials like teak leaves and banana trunk in civil engineering projects, which can enhance community acceptance and engagement.

B$)$ The ability of activated teak leaves and banana trunk to reduce heavy metal concentrations in wastewater, thereby meeting stringent environmental regulations and ensuring compliance with civil engineering standards.

C$)$ The speed of filtration achieved by activated teak leaves and banana trunk, which can impact the overall efficiency and effectiveness of wastewater treatment systems in civil engineering applications.

D$)$ The structural integrity and long$-$term durability of activated teak leaves and banana trunk, crucial factors for ensuring the sustainability and effectiveness of wastewater treatment solutions in civil engineering projects.