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# Emerson effect indicates the existence of

$\begin{array}{1 1}(A)\;\text{Two pigment systems}\\(B)\;\text{Two photosynthetic units}\\(C)\;\text{Two photophosphorylations}\\(D)\;\text{None of the above}\end{array}$

Emerson effect indicates the existence of two pigment systems
Hence (A) is the correct answer.