Please provide an explanation for the answer

Determine the BEST combination of plant and location to BBST

conserve the environment, given the following data:

$Kd=$ deoxygenation rate constant

$Kr=-$ reaeration rate constant.

Tc $=$ Travel time of wastewater discharge

$D=$ oxygen deficit

DO $=$ dissoived oxygen actual concentration

Factor

Sugar Plani $($A$)$

Factor

Ethanol Plant $($B$)$

$($B$)$

A$.$ Plant $($B$)$ in$.$ Marikina River

B$.$ Plant

$($B$)$ in Pasig River

C$.$ Plant

$($A$)$ in Marikina River

$.$ plant

$($A$)$ in Pasig River