The correct answer is D. Memo.
A memo field is a type of data field that can store a large amount of text. It is often used to store notes, comments, or other types of information that is not easily quantifiable.
An OLE object field is a type of data field that can store an object, such as a picture, sound file, or video file.
A sound field is a type of data field that can store a sound recording.
A voice field is a type of data field that can store a voice recording.
Memo fields are the most versatile type of data field, and they are the best choice for storing user voice recordings.