Which of the following nutrient elements is responsible for resistance to plant disease?

Answer: Option D

Potassium is the nutrient element is responsible for resistance to plant disease.
Potassium is associated with the movement of water, nutrients and carbohydrates in plant tissue. It's involved with enzyme activation within the plant, which affects protein, starch and adenosine triphosphate (ATP) production. The production of ATP can regulate the rate of photosynthesis.
Natural disease resistance mechanisms can be enhanced by plant nutrients like potassium.