(C) The $Protostele$ is considered the most primitive type of stele. In a $Protostele$,the central core of the stem consists of a solid column of vasc

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(C) The $Protostele$ is considered the most primitive type of stele. In a $Protostele$,the central core of the stem consists of a solid column of vascular tissue (xylem) surrounded by phloem,without a central pith. This type is commonly found in primitive vascular plants like $Psilotum$ and in the roots of many higher plants.