The most primitive type of stele is

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Eustyle

Solenstele

Protostele

Siphonostele

answer is C.

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Detailed Solution

Concept- Protostele is the earliest kind of stele. The stele is a tissue column composed of ground tissues and vascular tissues.
The conducting tissues that aid in the movement and conduction of materials throughout the plant are the vascular tissues. These vascular tissues, also known as conducting tissues, give plants mechanical support. The stems of many primitive plants and most roots are protostelic. There are three basic types of protostele: haplostele, actinostele, and plectostele. In a haplostele, the xylem is circular in cross-section or cylindrical in three dimensions; the phloem is immediately outside the xylem. It is the most straightforward siphon tale with the fewest gaps. One to several leaves can develop at once.
Hence, option 3 is the correct answer.

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