Of the Following, ______________ Would Be Most Vulnerable to Extinction

Of the following, ______________ would be most vulnerable to extinction.

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