The correct answer is D. provascular tissue.
Primary phloem is a vascular tissue that conducts food and nutrients in plants. It is located on the inner side of the stem and root, and it is made up of sieve tubes, companion cells, and phloem parenchyma cells.
Provascular tissue is the precursor to primary phloem. It is a group of cells that are located between the protoderm and the ground meristem. Provascular tissue is derived from the meristem, and it differentiates into sieve tubes, companion cells, and phloem parenchyma cells.
Lateral meristem is a type of meristem that is located in the vascular cambium. It is responsible for the secondary growth of plants.
Protoderm is the outermost layer of cells in the embryo. It is responsible for the formation of the epidermis.
Extrastelar cambium is a type of meristem that is located between the vascular cambium and the pith. It is responsible for the secondary growth of the pith.
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