The correct option is D Opuntia
In xerophytes like Opuntia, the stem is modified into a flat, green and succulent structure. Prickly pears typically grow with flat, rounded cladodes armed with two kinds of spines, large, smooth, fixed spines and small, hairlike prickles called as glochids, that easily penetrate skin and detach from the plant. Many types of prickly pears grow into dense, tangled structures.
Therefore, the correct answer is option D.