What is a biplane?

A biplane is correctly identified as an aircraft with two sets of wings. This design consists of one wing stacked above the other. The biplane configuration enhances lift and maneuverability, making it particularly effective for certain types of flight, especially during the era of early aviation. The dual wing structure increases the overall surface area available for generating lift, allowing biplanes to perform well at lower speeds and under various flight conditions. This design is often favored in aerobatics and for certain military and training aircraft due to its stability and agility.

The other choices do not accurately describe a biplane: a single set of wings refers to a monoplane, short-distance travel does not define the structure of a biplane, and cargo transport is not specific to any particular wing arrangement, as both biplanes and monoplanes can be used for such purposes.