The correct answer is C. Fields.

A field is the smallest unit of meaningful data in a data file. It is a column in a table that contains a single piece of information about a record. For example, a table of employees might have fields for employee name, employee ID, and department.

A file structure is the organization of data in a file. It defines the order of the fields in the file and the type of data that each field can contain.

A record is a group of related fields. For example, a record in a table of employees might contain the employee name, employee ID, and department.

A database is a collection of data that is organized so that it can be easily accessed and manipulated. It typically consists of multiple tables, each of which contains a set of related records.

E is not the correct answer because it is not a unit of meaningful data.