The Following Questions Refer to the Description Below

The following questions refer to the description below.
Theoretically, under ideal conditions, species can grow exponentially. In reality, however, species cannot maintain exponential growth indefinitely. Introducing species to habitats where conditions are optimal for that species often results in initial exponential growth.
-One example of exponential growth was seen with the introduction of European rabbits into Australia. Within a short period of time the rabbit population in Australia exploded. This invasive species efficiently grazed vegetation in all habitats it colonized and before long spread throughout most of Australia. Many factors can contribute to the exponential growth rate of the rabbit population; which of the these factors would likely slow down population growth?

A) lack of predators
B) abundant food supply, fast reproductive rate
C) introducing an aggressive competitor
D) releasing a pathogen/virus (biological control) that the European rabbit had not co-evolved with
E) C and D