Answer:
D. stone cells make fruit firm and berries are softer than pears
Explanation:
Stone cells are also called sclereids and are the short cells with thick lignified walls. Mature stone cells do not have any living content. Due to their lignified wall, stone cells make the plant part hard and gritty. Since berries are the soft and fleshy fruits, they do not have stone cells. Pears have gritty flesh due to the presence of stone cells in small clusters in it.