Dear student,
Plant B will show healthy growth and development because it has been given all the nutrients and other environmental conditions required by the plant to show healthy growth and proper development like moisture, water, nutrients and other fertilizers like Nitrogen, Phosphorus, Potassium (N.P.K) which increases the fertility of the soil.
The nutrient requirements of the plant involve all the nutrients required to increase the growth of the plant and to make it a healthy plant.It requires all the macronutrients like N,P,K and other micronutrients to increase the growth of the plant along with the fertile soil and water.
Regards