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# On the basis of symptoms of chlorosis in leaves a student inferred that this was due to deficiency of nitrogen.This inference could be corrected only if we assume that yellowing of leaves appeared first in

$\begin{array}{1 1}(A)\;\text{Old leaves}\\(B)\;\text{Young leaves}\\(C)\;\text{Young leaves followed by mature leaves}\\(D)\;\text{Mature leaves followed by young leaves}\end{array}$

On the basis of symptoms of chlorosis in leaves a student inferred that this was due to deficiency of nitrogen.This inference could be corrected only if we assume that yellowing of leaves appeared first in old leaves.
Hence (A) is the correct answer.