While researching a topic, a student has taken the following notes: The US Fish and Wildlife Service (FWS) keeps a list of all at-risk species. Species on the list are classified as either endangered or threatened. A species that is likely to soon become endangered is classified as threatened. The California red-legged frog is likely to soon become endangered, according to the FWS. The student wants to indicate the frog’s FWS classification category. Which choice most effectively uses relevant information from the notes to accomplish this goal?