Please choose the correct answer to the question: A rabbit population has increased noticeably in the past ten years. Which of the following is a reasonable hypothesis for this population growth?

Answer1: Competition for food has increased among rabbits. Answer2: The rabbit's main predator has been eliminated by human development. Answer3: Abnormal weather conditions have decreased water levels of the local ponds. Answer4: An organism that relies on similar food sources has migrated into the area.

Answer format: answer1/answer2/answer3/answer4