Kurukshetra February 2018 Issue on Agriculture, page 43 has given three key features of conservation agriculture viz: i. minimum soil disturbance by adopting notillage or minimum tillage and reduced traffic for agricultural operations. So, #2 is right. This eliminates Option-(A) ii. maximum soil cover by leaving crop residues on the soil surface. So, #4 is right. This eliminates Option-(D) iii. adopt spatial and temporal crop sequencing/crop rotation. So, # 5 is verbatim right. Hence final answer (C)