Please choose the correct answer to the question: In the past, wild hogs called "javelinas" were seen only in the southern part of New Mexico. Now, javelinas are seen in areas 100 miles further north. What is the most likely cause of this expansion?

Answer1: Javelinas are reproducing less frequently. Answer2: Environmental conditions have changed. Answer3: The javelina's genetic traits have mutated. Answer4: Nutritional requirements of javelinas have changed.

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