Which of the Following Would Be Most Vulnerable to Extinction

Multiple Choice

Which of the following would be most vulnerable to extinction?

A) A migratory flock of warblers stopping along its winter route to feed on local resources that are now gone and replaced by a suburb
B) A moth,brought to the United States for silk production,escaping into the wild and becoming established
C) An orchid endemic to a forest where logging is occurring
D) A healthy plant,such as a pine tree,that completely dominates its native environment