"The crop is subtropical in nature. A hard frost is injurious to it. It requires at least 210 frost-free days and 50 to 100 centimeters of rainfall for its growth. A light well-drained soil capable of retaining moisture is ideally suited for the cultivation of the crop." Which one of the following is that crop ?

Cotton is the correct choice because the specific requirement of **210 frost-free days** and 50–100 cm of rainfall are its defining physiological characteristics as per standard NCERT geography. While Sugarcane is also frost-sensitive, it is incorrect because it typically requires higher annual rainfall (75–150 cm) and a more humid environment than the conditions described. The core concept being tested is the **agro-climatic requirements** and specific environmental constraints of major Indian cash crops.