Why is it important to follow label instructions when applying pesticides?

Following label instructions when applying pesticides is important because it ensures legal use and helps prevent harm to non-target organisms. While option B may seem correct, maximizing pest control may also lead to unintended harm to other organisms. Option D is not entirely accurate because following label instructions does not guarantee all of the above options, it only primarily ensures legal use. Therefore, option A is the best choice as it takes into account legal and ethical considerations when using pesticides.