Final answer:
Without specific system or platform context, it's impossible to definitively say which element listed cannot be edited in a form, as customizability varies. Additional details are needed to provide an accurate answer.
Step-by-step explanation:
The question asks which of the following cannot be edited in a form: A. Submit button text. B. Error and validation text. C. Social button text. D. Label text. Generally, in form design and customization on various platforms, all these elements are typically editable to maintain consistency with the form's overall design and to enhance user experience. However, without specific context or a platform in question, it's difficult to determine a definitive answer, as customizability can vary between different form builders and systems.
Therefore, without further context about the form's environment or the system used to manage it, we cannot conclusively determine which of the options provided cannot be edited in a form. For more targeted assistance, additional details such as the form builder or system specifications would be required.