Final answer:
D) Matrix
A Matrix structure is a type of organizational chart that combines functional and divisional chains of command, reflecting both vertical and horizontal command structures for more flexibility.
Step-by-step explanation:
The type of organizational structure that combines functional and divisional chains of command in a grid, resulting in two command structures, vertical and horizontal, is called a Matrix. This is different from a centralized structure where authority is concentrated at the top, and unlike a purely divisional or functional structure that follows a more traditional hierarchy. The matrix structure allows for more flexibility and can respond faster to changes in the environment by integrating multiple dimensions of the business.