I was stuck between A and D but I believe the answer is A. I believe jewlery can be worn if it is small and not hanging for example stud earrings. Hanging jewlery can be a threat to the healthcare providers and the patients themselves as it can get tangled up in medical equiptment or in some cases patients can pull on them, harming the provider. D is also somewhat correct but I haven't read anything about jewlery contaminating scenes, the reason I've heard more often is that most jewlery hangs.
Since there are no options listed to choose from, my best guess would be watches, since a lot of apple watch products are now sold with built in heart monitors.
