Explanation:

- The correct answer is: Option 2 - jute.

- Jute: India lost a significant part of its jute-growing areas to East Pakistan (now Bangladesh) during Partition. This was a major economic concern, as most of the jute mills remained in India.

- Sunflower: Not a major crop in the region affected by the 1947 partition and had little impact on agriculture between the two nations.

- Soyabean: Though important now, it was not widely grown or a major crop at the time of partition.

- Cotton: While some cotton regions were affected, the major loss was actually for jute, not cotton.