Which of the following data types is complete?

The choice of the character data type (C) as a complete data type is appropriate due to its usage and characteristics within ABAP. In ABAP, the character data type is designed to hold character strings, which can be of fixed length or variable length depending on how they are declared.

When we refer to a complete data type, it generally implies that the type can fully represent various forms of data without additional qualifiers or constraints; in this case, character types can store any range of character symbols, making them versatile for many applications, such as storing names, text, or any alphanumeric data.

To provide additional context, while other data types like numeric (N), packed (P), and string may serve specific functions within ABAP, they do not encapsulate the breadth of character representation that the character type does. Numeric types are limited to numbers, packed types are specifically formatted for decimal representation, and strings are often variable in length and require management of this length, which can complicate certain operations. Thus, the character type stands out as the most complete in terms of broad applicability and straightforward usage in ABAP programming.