The cell functionally associated with sieve tube is

Phloem fibres

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Phloem parenchyma

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Companion cell

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Collenchyma

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Solution

The correct option is C Companion cell
The sieve-tube members are completely associated with companion cells for its function. The dense cytoplasm of a companion cell is connected to the sieve-tube element by plasmodesmata which provides the nutrient to support the sieve tubes as they lack nucleus and some of the organelle at maturation.
So, the correct answer is option C.

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