[A]: Senescence is induced by the applica- tion of cytokinin in plants.
[R]: Cytokinin promotes the breakdown of chlorophyll, proteins and nucleic acid.
A. If both A and R are true and R is the correct explanation of A
B. If both A and R are true but R is not the correct explanation of A
C. If A is true and R is false
D. If both A and R are false