__________ offers the advantage of reducing the amount of loose filing quickly.

A. Batch

B. Drop

C. Volume

D. Unit

The correct answer is A. Batch.

To determine the answer to this question, we need to understand what each of the options means in relation to reducing the amount of loose filing quickly.

A. Batch: A batch refers to a group of items or processes that are processed together as a unit. In the context of reducing loose filing, a batch could involve organizing and processing a set of loose files at once, which can help in reducing them quickly.

B. Drop: 'Drop' does not seem relevant to the context of reducing loose filing quickly. Dropping can refer to eliminating or discarding something, but it does not specify a method or process of organization.

C. Volume: 'Volume' refers to the quantity or amount of something. While reducing the volume of loose filing may be an objective, it does not specify any particular method for achieving this quickly.

D. Unit: 'Unit' typically refers to a single item or entity. It does not indicate a method or process to reduce loose filing quickly.

Given the options, A. Batch is the most appropriate choice as it specifically mentions a process or action that can be taken to reduce the amount of loose filing quickly.