What key factor determines eligibility for OAA?

The key factor that determines eligibility for OAA (Ownership Advancement Award) is adjustments for shared profits and income growth. This option highlights the underlying principle of the program, which is to incentivize and reward employees based on the financial performance and shared success of the company.

When shared profits increase and income growth is achieved, it reflects a direct correlation between the contributions of employees and the overall financial health of the organization. This alignment is crucial for determining who is eligible for the award, as it emphasizes rewarding those whose efforts have directly contributed to better company performance.

In the context of other options, while sales growth, safety audit scores, and compensation adjustments may reflect various aspects of business performance or management practices, they do not directly link to the core principle of shared profits and income growth that is integral to the OAA. Thus, the selected answer encapsulates the fundamental criteria for eligibility in the program.