Which definition refers to an arrangement of elements of a unit in a prescribed manner?

The term "formation" specifically refers to the arrangement of elements of a unit in a prescribed manner, especially in a military context. In drill and ceremonial contexts, formations are strategic configurations intended to achieve a particular purpose, such as aesthetics during parades or tactical advantages during maneuvers. Formations often involve specific spacing and alignment of personnel or units, ensuring cohesiveness and discipline.

In contrast, terms such as "line," "column," and "row" should be understood as specific types of formations or arrangements. While they indicate certain arrangements, they do not encapsulate the broader concept of organizing elements in a purposeful, structured way that "formation" does. For instance, a line is a formation where individuals stand next to each other; a column refers to individuals arranged one behind the other, while a row denotes items or individuals placed side by side. Thus, "formation" serves as the overarching definition that encompasses these specific arrangements, making it the correct answer.