(A) Necrosis is the localized death of plant tissue,especially in leaves.It is primarily caused by the deficiency of mineral elements such as $Ca$,$Mg

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(A) Necrosis is the localized death of plant tissue,especially in leaves.It is primarily caused by the deficiency of mineral elements such as $Ca$,$Mg$,$Cu$,and $K$.Among the given options,$Ca$,$Mg$,and $K$ are well-known elements whose deficiency leads to necrosis in leaves.Therefore,the correct set of elements is $Ca, Mg, K$.