The correct answer is A. Xylem.
Tracheids are elongated, dead cells that are found in the xylem tissue of vascular plants. They are the main water-conducting cells in plants, and they play an important role in the transport of water and minerals from the roots to the leaves. Tracheids are also involved in the support of the plant body.
Phloem is the tissue that transports food from the leaves to the rest of the plant. It is made up of living cells called sieve tubes, which are connected to each other by sieve plates. Phloem also contains companion cells, which help to support the sieve tubes and transport sugars.
Cambium is a lateral meristem that is responsible for the growth of the plant in thickness. It is made up of two types of cells: fusiform initials and ray initials. Fusiform initials divide to produce new xylem cells on the inside and new phloem cells on the outside. Ray initials divide to produce new cells that form the vascular rays, which are bands of tissue that run radially through the stem.
None of these is the correct answer.