Which description best describes xylem vessel elements?
- Acells joined to form a tube, pits at intervals, sieve plates between cells, surrounded by the endodermis in roots
- Bcontains cells joined end to end, containing cytoplasm, cell walls with lignin, located to the outside of phloem in vascular bundles
- Ccontains elongated cells with end walls broken down, located in vascular bundles in the stem and centrally in the roots
- Ddead elongated cells, lignified cell walls with pits at intervals, associated with companion cells in the roots only