I find that I do my best work when under pressure. I enjoy undertaking challenging assignments and finding creative solutions. One time I had two projects that were due the same week. Instead of stressing out, I created a detailed schedule that allowed me to complete both assignments on time.
Stress is a part of life, and your potential employer wants to know that you will not completely shut down when handed multiple responsibilities. You should be able to tackle anything that comes your way and be a productive employee no matter what you are working on.