The data you provided seems to suggest multiple choice responses, but it's not clear which one is correct or which question you're referring to. However, generally speaking, studies show that a significant percentage of retirees do return to work in some capacity.
Research from various sources has indicated that about 20-30% of retirees choose to go back to work after retiring. If you're looking for a specific percentage from a study, that will vary across different surveys and reports.
If you can clarify which specific study or statistics you’re referring to, I’d be happy to help further!