Universal Containers (UC) wants to delete data in several fields for 5,000 Lead records.

The correct answers are C. Use Data Loader to update leads using the CSV file and D. Select Insert Null Values in Settings.

Universal Containers wants to delete values from fields on 5,000 Lead records. The correct method is to use Data Loader Update with the record IDs in the CSV file, leave the target field cells blank, and enable Insert Null Values so Data Loader treats the blank CSV values as null updates. Salesforce Help explains that to change field values to blank/null with Data Loader, export IDs and fields, clear the values in the CSV, select Insert Null Values, and run an update.

Why others are incorrect:

A is unrelated because record type selection does not delete field values.

B is not the best choice because the Import Wizard is not the proper tool for mass clearing field values using null updates.