Final answer:
The paper-based storage system that conserves floor space and eliminates excess aisles is the mobile filing units. These units are designed to be moved to open or close aisles and make efficient use of space.
Step-by-step explanation:
The type of paper-based storage system that conserves floor space by eliminating all but one or two aisles is C. Mobile filing units. These are compactable storage units that can be moved in order to create or close aisles as necessary. Unlike traditional stationary filing cabinets, mobile systems make use of a single aisle, maximizing the use of space. You open an aisle where needed by moving the entire unit or a row of units. They are commonly used in settings where a lot of materials need to be stored efficiently, such as libraries, archives, or records departments.