When you delete a groupbox the controls inside it are . . . . . . . .

The correct answer is: D. Deleted

When you delete a groupbox, all of the controls inside it are deleted as well. This is because

Option A is incorrect because the controls are not retained when the groupbox is deleted.

Option B is incorrect because the controls are not given to another groupbox when the groupbox is deleted.

Option C is incorrect because data loss does not occur when you delete a groupbox. The controls inside the groupbox are deleted, but the data that they contain is not lost.

I hope this helps! Let me know if you have any other questions.