The correct answer is - c. habitat loss through urban sprawl.
The rabbits are known for their very fast reproduction and increase in number of their populations, but this is only possible when the conditions are right. So when there's a rabbit population that has enough space and food it will grow on number, but once the food sources are starting to be limited or declining and the space is occupied by humans than this process is no longer possible, so the rabbit population stagnates, and if the process of loss of habitat and food sources continues than the rabot population will start to decline.
