The correct option is B macronutrients
Plants require nutrients for their growth and development just like animals do. Plant nutrients are broadly classified into two main categories - macronutrients and micronutrients. Macronutrients are those which are required by plants in large amounts whereas, micronutrients are those which are required in small amounts. E.g. Nitrogen, phosphorus are examples of macronutrients and iron, zinc are examples of micronutrients.