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# Annual rings and growth rings are formed due to fluctuation in the activity of :-

$\begin{array}{1 1}(A)\;\text{Xylem}\\(B)\;\text{Phloem}\\(C)\;\text{Both}\\(D)\;\text{cambium}\end{array}$

Due to differential seasonal activity of cambium,alternate light & dense wood is cut off leading to formation of annual rings.
Hence (D) is the correct answer.