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# Rhizosphere is the region where

$\begin{array}{1 1}(A)\;\text{Rhizobium forms root nodules}\\(B)\;\text{Algae and root make contact}\\(C)\;\text{Soil and root make contact}\\(D)\;\text{Bacteria and root nearly make contact}\end{array}$

Rhizosphere is the region where soil and root make contact
Hence (C) is the correct answer.