Select the correct option which best suits the given descriptions for P, Q, R and S.
P - A simple tool used for removing weeds
Q - A tool which is used for ploughing with the help of a tractor
R - A tool which is used for sowing with the help of a tractor
S - A simple tool used for cutting of crops
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 with the help of tractors. Manually, cutting of crops (harvesting) is done by sickle (S).