Fluorine
Potassium
Lead
Aluminium
Answer is Right!
Answer is Wrong!
The correct answer is B. Potassium.
Potassium is an essential element for plant growth. It is involved in many important plant processes, including photosynthesis, protein synthesis, and water transport. Potassium fertilizers are used to supplement the potassium levels in the soil, which can be depleted by crop production.
Fluorine is not used in the manufacturing of fertilizers. It is a highly reactive element that can be toxic to plants.
Lead is also not used in the manufacturing of fertilizers. It is a heavy metal that can be toxic to plants and animals.
Aluminium is not used in the manufacturing of fertilizers. It is a light metal that is not essential for plant growth.
In conclusion, the correct answer is B. Potassium.