Option B “the interior of a sieve tube” is part of the symplast. Also known as a protoplast, symplast is the intercellular connection or region in the plasma membrane which serves as a bridge between plant cells.
Small intercellular connections are called microscopic channels. These are living spaces that are found between cells and cell membranes.
A symplast is composed of compassion cells, axial parenchyma, sieve tubes, ray parenchyma, plasmodesmata, and the cambium.
To put it simply, it is the internal part of the plasma membrane within a plant where the transport of water vapors and other small-sized molecules such as amino acids, ions, and sugars takes place spontaneously.
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