Your interviewer needs to ensure that anyone they hire can be counted on to do the right thing, all day, every day. "Our ethical performance is the sum of the daily behavior of each one of us. Our continued success counts on all employee-owners always doing the right thing." They, therefore, offer anonymous and confidential channels to voice concerns, through their "Integrity Helpline" which is "open to all employees and authorized representatives." So, when answering this question, familiarize yourself with the expectations they hold their employees to, and look back on your professional experiences, and share any examples of where your decision making was well-aligned with what they consider, "doing the right thing."