In JavaScript, what does a variable declaration typically look like?

A variable declaration in JavaScript typically follows the syntax that includes a keyword for variable declaration, the name of the variable, an assignment operator, and then the value being assigned. The correct choice illustrates this format with the syntax: 'var variableName = value;'.

In this construct, 'var' is one of the keywords used to declare a variable. Following the keyword is the variable name, which follows naming conventions in JavaScript, and then the equals sign '=' acts as the assignment operator, allowing for the initialization of the variable with a specific value.

Using 'let' for variable declaration is also valid in JavaScript, but its correct syntax requires an equals sign for assignment, which might not be represented properly in the other options. Similarly, 'const' is another valid keyword for declaring constants, but it too requires the '=' operator and not the ':='. Lastly, 'define' is not a recognized keyword in JavaScript for variable declaration, making it an incorrect representation of how a variable is typically declared in the language.