21) Zara has discovered the perfect size of operation for her bagel business. It has become profitable, so she opens a second location on the other side of town with the same amount of building space, equipment, and workers. With this growth, why will Zara most likely experience returns to scale? A) Total costs and total output increased at the same rate, so average costs didn't change. B) Total costs and total output both remained the same, while average costs decreased C) Total costs remained the same while output increased, so average costs decreased D) Total costs, total outputs, and average costs all remained unchanged