What mathematical function is expected to provide the best fit to the turbidity data obtained from coagulant/flocculant dosage optimization?

What mathematical function is expected to provide the best fit to the turbidity data obtained from coagulant/flocculant dosage optimization? a.) f(x)=mx+b b.) f(x)=Aeiwt c.) f(x)=x2 d.) f(x)=x3 What mathematical function is expected to provide the best fit to the turbidity data obtained from coagulant/flocculant dosage optimization? a.) f(x)=mx+b b.) f(x)=Aeiwt c.) f(x)=x2 d.) f(x)=x3