Answer:
Organic structure.
Step-by-step explanation:
Organic structure: It is defined as flat organizational structure as it does not follow normal hierarchical structure, it is more of a decentralized structure with a lesser layer of management at every level, where more information is shared among employee and each department co-operate with other departments, which helps the organization to adapt well with the changes. Employees have the opportunity to participate in the decision-making process of the organization.
In the given case, Steel manufacturing firm are following an environment that is simple and integrated but also dynamic and hostile, which is a perfect organic structure.