Final answer:
The XML element used to code a preference that uses a check box is the CheckBoxPreference.
Step-by-step explanation:
The subject of question is technology.
The XML element used to code a preference that uses a check box is the CheckBoxPreference. It allows users to select or deselect an option by clicking on a check box. This element is commonly used in Android app development to create settings screens where users can enable or disable specific features or options.