Final answer:
The status of Amur leopards in 2018 cannot be determined from the 2007 IUCN Red List data provided. Updated information is needed for an accurate assessment, making D the correct choice.
Step-by-step explanation:
The question regarding the conservation status of Amur leopards in 2018 cannot be answered with certainty based solely on the provided information, which dates back to the 2007 IUCN Red List. The text explicitly describes the development of the Red List categories and criteria by the International Union for Conservation of Nature (IUCN) to assess the status of species on a scale from Extinct to Near Threatened, including the categories of Critically Endangered, Endangered, and Vulnerable.
Examples of critically endangered species provided include the Siberian tiger and the mountain gorilla, but the Amur leopard is not mentioned in the given data. To determine the status of the Amur leopard in 2018, updated information from the relevant year or the current IUCN Red List would be necessary.
According to the options provided, the answer would be D. Data is insufficient to determine their status.