Lack or low levels of Potassium, Nitrogen, Sulphur and Molybdenum causes ___.

Given mineral ions essential for the physiological activities of plant
$\mathrm{A})$ Nitrogen metabolism
$\mathrm{B})$ Synthesis of Auxins
$\mathrm{C})$ Activation of IAA oxidase enzyme
$\mathrm{D})$ Formation of Mitotic spindle

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