Crinkle leaf of cotton is caused by

✅Explanation:
Manganese toxicity may occur on soils that are strongly acidic, below pH 5.2.
Crinkle leaf of cotton is a physiological disorder primarily caused by manganese (Mn) toxicity. Excess manganese interferes with the normal development of leaf tissues, leading to crinkling, puckering, and distortion of the leaves.

📌 Other Options Explanations:
-Option A: Fe toxicity: Iron toxicity typically causes bronzing or interveinal chlorosis in plants.
-Option B: Cu toxicity: Copper toxicity can lead to stunted growth and chlorosis in plants.
-Option D: Zn toxicity: Zinc toxicity can cause various symptoms like chlorosis and reduced growth.