B. Identify top project priorities.

When using Salesforce Optimizer for the assessment of Universal Containers' Salesforce org, the primary purpose is to identify top project priorities. The tool provides insights into various aspects of the org, including configuration, customization, and usage metrics. By analyzing the output from Salesforce Optimizer, the business analyst can pinpoint areas of improvement, potential issues, or areas where enhancements are needed. These findings help prioritize which aspects of the Salesforce org require attention and can guide the development of a roadmap for improvements and optimization.

It's B