To create a custom metric for display on Agreement Terms, you need to create custom fields on the Sales Agreement Product and Sales Agreement Product Schedule objects, and map them using the Data.com Administration tool. The custom fields must have the same data type as the default fields, and only number, currency, and formula field types are available for mapping. Therefore, the correct answer is C. Only number, currency, and formula field types are available for mapping. References: Customize Salesforce Field Mappings, Create Custom Fields for Sales Agreement Products and Schedules