The correct option is C Tracheids
Xylem and phloem together constitutes the vascular bundles which helps in transportation of substances within plants.
Xylem helps in transportation of water and minerals and is composed of four compoenents i.e., tracheids, vessels, xylem parenchyma and xylem fibres.
While phloem helps in translocation of food and this also composed of four components i.e., sieve tube, companion cells phloem parenchyma and phloem fibres. In sieve tube, cells are seprated by sieve plates which bears numerous pores on it.