The correct answer is (C) Potassium.
Mottled chlorosis is caused due to the deficiency of potassium in plants.
Potassium is a macronutrient, which is required by plants in the form of potassium ions.
In plants, potassium plays an important role in maintaining the turgidity of the cells, maintains the balance of ions and is also involved in the opening and closing of stomata.
The deficiency symptoms of Mottled chlorosis are mainly seen in leaves, yellowing and curling of leaves, loss of apical dominance, plastid disintegration, etc.
Explore more such questions and answers at BYJU’S.