A: No. Only instructors have the ability to remove a student from an opportunity they are assigned to. This is primarily done to prevent students from accidentally cancelling an opportunity they did not mean to cancel, and to prevent frustration from clinical sites.
For example, if 12 students signed up for ride time opportunities at a clinical site at 8am, but only 2 students showed up, the site would not necessarily know if the other 10 students are late or had cancelled their opportunities for that day. This would, understandably, cause some frustration.
Since only instructors can remove a student from an opportunity, they could then notify the site that a student would not be attending that shift.