what happens to the data on any ephemeral store volumes?

When an EC2 EBS-backed (EBS root) instance is stopped, what happens to the data on any
ephemeral store volumes?

A.
Data will be deleted and win no longer be accessible

B.
Data Is automatically saved in an EBS volume.

C.
Data Is automatically saved as an E8S snapshot

D.
Data is unavailable until the instance is restarted