................. are data items, of any type, whose contents may change in value as the program executesConstantsVariablesSimple dataComplex data

The correct answer to the question is Variables.

Explanation:

• Variables are data items whose values can change during the execution of a program. They can store different types of data, including integers, floating-point numbers, strings, and more. The ability to alter their values is fundamental to the dynamic nature of programming.

• Constants, on the other hand, are similar to variables but their values remain fixed after they are set.

• Simple data and Complex data refer to data types but do not specifically describe data items that can change in value during program execution.

In summary, out of the provided options, Variables best fits the description of data items that may change in value as the program runs.