Rubber cultivation in India is concentrated in specific regions with suitable tropical climate. Kerala (A) is the largest rubber-producing state, with plantations in Kottayam, Pathanamthitta, and other districts. Karnataka (B) has rubber in Kodagu and Chikmagalur districts. Tamil Nadu (C) grows rubber in Kanyakumari and Nilgiris. Assam (D) is not a major rubber producer - its climate and terrain are more suitable for tea, though some experimental rubber plantations exist.