I have two SharePoint lists. List A and List B:

List A is for for scheduling sessions (11 different sessions) for participants (a multi-select field)

List B is for tracking participants attendance to sessions. Each list item should represent a single session, for a single participant.

In List A, the administrator inputs multiple users into a participants field and the workflow will update List B's "Attendance Status" to either "Attended or Not-Attended" based on a User Task sent to the participants.

How can I set the update list item filters in K2 correctly so that only the list items for the participants entered in list A  are updated in list B?