Consider the following agricultural practices : 1. Contour bunding 2. Relay cropping 3. Zero tillage In the context of global climate change, which of the above helps/help in carbon sequestration/storage in the soil ?

While contour bunding and relay cropping are beneficial for soil conservation and increasing biomass (which prevents carbon loss), Zero Tillage is the most direct and scientifically prioritized practice for sequestering carbon by minimizing soil disturbance and organic matter decomposition. Zero tillage preserves soil organic carbon by leaving the soil structure undisturbed, reducing oxidation of organic matter. Therefore, the correct option is B (3 only).