Please choose the correct answer to the question: Monarch butterflies use milkweed plants during all of their life stages. Milkweed plants grow in open areas, such as grasslands and wetlands. They also often grow between row crops. Given this information, which of these biotechnologies would pose the greatest threat to monarch butterflies?

Answer1: development of new antibiotics Answer2: development of new herbicides Answer3: development of disease-resistant crops Answer4: development of insect-resistant crops

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