The correct option is B Etiolation
Necrosis, chlorosis and shortening of internodes are important deficiency symptoms, which are caused due to deficiency of mineral elements in plants.
Etiolation means growth of plants in absence of sunlight. As sunlight is an important requirement for chlorophyll biosynthesis. These plants will be pale in color and have thin elongated internodes.
So, the correct answer is 'Etiolation'