According to the ArchiMate 3.2 Specification1, the ArchiMate core language defines a structure of generic elements and their relationships, which can be specialized in different layers. Three layers are defined within the ArchiMate core language as follows:
The Business Layer depicts business services offered to customers, which are realized in the organization by business processes performed by business actors and roles.
The Application Layer depicts application services that support the business, and the applications that realize them.
The Technology Layer comprises both information and operational technology. You can model, for example, processing, storage, and communication technology in support of the application world and Business Layers, and model operational or physical technology with facilities, physical equipment, materials, and distribution networks.

According to the standard notation conventions, a structure element is denoted by a rectangle with rounded corners. A structure element represents an entity that has a state and exhibits some behavior. Examples of structure elements are actors, roles, components, nodes, and objects.

Based on the ArchiMate 3 documents or objectives, a data object is a passive structure element that represents a piece of data that can be manipulated by behavior elements such as application functions or services. A passive structure element is a structural element that cannot perform behavior. Active structure elements can perform behavior on passive structure elements.

According to the ArchiMate 3.2 Specification1, external active structure elements are also called interfaces. An interface represents a point of access where one or more services are offered by an active structure element to its environment1. Therefore, the correct answer is B. Interfaces.

The diagram shows a work package, which is a grouping of behavior and/or structure elements that can be assigned to one or more performers. A work package can be used to model a project or a program, and it can contain deliverables, which are outcomes of the work package. The four elements (A, B, C, and D) are all deliverables that are part of the work package.