Farmers in a particular region were concerned that pre-mature yellowing of leaves of a pulse crop might cause decrease in the yield. Which treatment could be most beneficial to obtain maximum seed yield ?

Question

( A ) Removal of all yellow leaves and spraying the remaining green leaves with 2,4,5-trichlorophenoxy acetic acid
( B ) Application of iron and magnesium to promote synthesis of chlorophyll
( C ) Treatment of the plants with cytokinins alongwith a small dose of nitrogenous fertilizer
( D ) Frequent irrigation of the crop