Which of These Is an Example of an Anthropogenic Allee

Which of these is an example of an anthropogenic Allee effect?

A) As rhinos become rarer, there is an increased effort by poachers to obtain their increasingly valuable horns.
B) The extinction of island endemics is often coupled with the introduction of cosmopolitan species.
C) As the population of a species of butterflies drops, there is more inbreeding in the species.
D) The introduction of an invasive grass species alters the ecological relationships of other species.