The correct option is D P-Hoe, Q-Cultivator, R-Seed drill, S-Sickle
Hoe (P) is a simple tool which is used for removing weeds and for loosening the soil. Cultivator (Q) is attached to a tractor. Such tractor-driven cultivators save labour and time. Seed drill (R) is a modern tool used for sowing and removing weeds. Manual cutting of crops (harvesting) is done using sickle (S).