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# Mutations can be induced by

$\begin{array}{1 1}(A)\;\text{Magnetic radiations}\\(B)\;\text{Gamma rays}\\(C)\;\text{Nitrous acid,nitromethyl urea}\\(D)\;\text{All of these }\end{array}$

Mutations can be induced by magnetic radiations,gamma rays,nitrous acid,nitromethyl urea.
Hence (D) is the correct answer.