The two narratives that would be most appropriate for an omniscient point of view are:
c. Numerous attendees to a Victorian ball interact and vie for the most desirable matches to dance with - This scenario involves multiple characters and their interactions, making it suitable for an omniscient narrator who can provide insight into the thoughts and feelings of various attendees.
d. A yacht capsizes, and a group of survivors land on a deserted island - This narrative involves multiple characters reacting to a crisis, and an omniscient point of view would allow the narrator to delve into the experiences and perspectives of different survivors as they navigate the challenges they face on the island.