Answer:
The correct word for the blank space is: minimal.
In the event of a major disaster, the first goal of the business is to maintain the (minimal) sustainable level of services for the organization.
Step-by-step explanation:
Disasters are events of God and as such, they cannot be predicted. In most cases, they affect all the economic activities within the region where it takes place. For a business, it is crucial to at least keep the minimal conditions of its operations after the disaster so the losses for the current period will not affect the firm's sustainability in the long run.