The correct option is Jute.
Explanation
Jute is a long, soft, shiny bast fiber that can be spun into coarse, strong threads. It is widely known as the "Golden Fibre" due to its color and economic value. It is one of the most affordable natural fibers and is second only to cotton in the amount produced and variety of uses.
Detailed Analysis
- Jute: This crop is specifically cultivated for its strong fibers, which are used to manufacture gunny bags, mats, ropes, yarn, carpets, and other artifacts. It is a biodegradable material extensively used in packaging.
- Cotton: Cotton is primarily a textile fiber used for making clothing and household fabrics. It is not the primary material for coarse industrial products like gunny bags.
- Hemp: While hemp is used for making ropes and industrial canvas, the specific combination of gunny bags, mats, and carpets in the context of Indian agriculture refers to jute.
- Silk: Silk is a protein fiber produced by silkworms (sericulture). It is a luxury fiber used for high-value textiles and garments, not for rough industrial applications.
Key Takeaway: Jute, or the "Golden Fibre," is the primary raw material for the sacking and packaging industry, specifically used for making gunny bags, mats, and carpets.