What Statement Best Describes a Variable and Its Primary Purpose

What statement best describes a variable and its primary purpose?

A) A variable is a structured, general-purpose language designed primarily for teaching programming.
B) A variable is a collection of eight bits.
C) A variable is a word that has a special meaning to the compiler.
D) A variable is a named storage location in the computer's memory used for holding a piece of information.
E) A variable is a "line" of code in the body of a program, that may change.