Which of the following is a region that produces cells in a plant?

a. Cork cambium

c. Vascular cambium

b. Apical meristem

d. All of the above

Cork cambium, apical meristem, and vascular cambium. So the answer is D

The cork cambium is a lateral meristem and is responsible for secondary growth that replaces the epidermis in roots and stems. The vascular cambium (plural cambia) is a plant tissue located between the xylem and the phloem in the stem and root of a vascular plant, and is the source of both the secondary xylem growth. A meristem at the tip of a plant shoot or root that produces auxin and causes the shoot or root to increase in length. Growth that originates in the apical meristem is called primary growth.