Adidas is using 3D printed shoes which will be custom made at first and then mass manufactured, as unit costs fall. Three-dimensional printing is expected to dramatically reduce businesses' carbon footprints because the technology _______. a. is usable only locally and thus will tend to promote local economies that are small b. will be heavily taxed so that the tax revenues can be channeled into green programs c. enables the use of only recyclable raw materials and renewable energy sources d. nearly eliminates transportation of finished goods to distribution centers and retailers