A system in which a crop is planted directly into an untilled seedbed after harvesting of the previous crop is called as-
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Answer: B
It is Zero tillage.
In zero tillage (no-till), the next crop is sown directly into the untilled soil after the previous crop is harvested, usually with a zero-till drill that cuts a narrow slit and places the seed. In the rice-wheat system it saves time, fuel and water and lets wheat be sown earlier.
Mulch tillage loosens the soil while leaving residues on the surface. Deep tillage breaks hardpans at depth, and contour tillage works across the slope. All three involve tilling.
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