To help the sales team at Universal Containers prioritize high-value prospects, mapping the Lead Budget field to the Opportunity Amount field during lead conversion is the most effective solution. This ensures that budget information gathered on the lead is directly available on the Opportunity, enabling sales reps to quickly assess potential revenue and prioritize accordingly.

Data Transfer on Conversion: By mapping the Budget field from the Lead to the Opportunity’s Amount field, sales reps can immediately see if the opportunity meets the $10,000 threshold, streamlining their prioritization process.

Field Mapping During Lead Conversion: Salesforce allows custom field mapping from Lead to Opportunity, ensuring that critical data, such as budget, is retained and accessible during and after conversion.

Option A (approval process) could add unnecessary steps, and Option B (mapping to an Opportunity Revenue field) is incorrect since "Revenue" is not a standard Opportunity field. This method aligns with best practices for field mapping as detailed in Salesforce's Guide on Custom Lead Field Mapping.