The correct answer is: D. Available fields
The Available fields list is a list of all the fields that are available for the current view. To add a field to the Selected fields list, you can double-click its name in the Available fields list.
The Find fields list is a list of all the fields that match the search criteria that you specify. The Search fields list is only available when you are in the Find mode.
The Search record list is a list of all the records that match the search criteria that you specify. The Search record list is only available when you are in the Search mode.
I hope this helps! Let me know if you have any other questions.