Please choose the correct answer to the question: The snowshoe hare was once common in Maryland. In 1986, researchers in the state noted that the snowshoe hare was no longer found in Maryland. Which statement best explains why the snowshoe hare is no longer found in Maryland?

Answer1: Water quality has improved. Answer2: There are too many trees. Answer3: The temperature is too cold. Answer4: Housing developments have replaced fields.

Answer format: answer1/answer2/answer3/answer4
Answer: answer4