Annual rings are well seen in

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(C) Annual rings are formed due to the differential activity of the vascular cambium in response to seasonal variations in temperate regions.In $Pinus

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Pinus wood

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(C) Annual rings are formed due to the differential activity of the vascular cambium in response to seasonal variations in temperate regions.In $Pinus$ (a gymnosperm),the vascular cambium is highly active during the spring season,producing spring wood (early wood) with wider vessels/tracheids,and less active during the autumn season,producing autumn wood (late wood) with narrower vessels/tracheids.The combination of one band of spring wood and one band of autumn wood constitutes an annual ring.Therefore,annual rings are well-defined and clearly visible in the wood of $Pinus$.

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