Plant cells without nucleus is
A. Root hairs are unicellular, uninucleated, tubular extensions or outgrowths develop from the epidermal cells of the root.
B. Xylem vessel elements are elongated, water conducting channels formed by an end to end fusion of a large number of empty thick walled lignified cells.
C. Companion cells are the thin-walled living parenchyma cells associated with the sieve tubes of the phloem.
D. Cambium cells are the meristematic cells, meant for the formation of secondary tissues.
So the correct answer is ‘Xylem vessels’.