A customer wants to distribute the costs of a benefits element, which is at payroll...

Comprehensive and Detailed in Depth Explanation:

To distribute costs of a benefits element (at payroll relationship level) to employee earnings in Oracle Payroll Cloud, you must create a distribution group containing the target earnings elements and configure distributed costing on the relationship-level element. This ensures costs are allocated proportionally across specified earnings. Option A ("Fixed Costed") does not support distribution to earnings, Option B is incorrect as cost distribution is possible, and Option C ("Costed") lacks the specificity of a distribution group, which is required for this scenario. The process is detailed in the "Costing Setup" section of the Oracle documentation.