Final answer:
The correct answer is A, a roadway, which serves as an intra-sector system component by connecting with other transportation system elements like parking structures to form a network.
Step-by-step explanation:
A component of an intra-sector system is an element that works within a single sector and interacts with other elements within the same sector to function collectively. For example, transportation is a component because it encompasses various interconnected entities such as roads, bridges, and traffic signals, which are all parts of the automotive transportation infrastructure necessary for the operation of a society. Within transportation infrastructure, a roadway is a component because it directly connects to other components in the system, such as parking structures, creating a network.
A sewer beneath a roadway, while it may seem to connect different intra-sector systems (such as transportation and waste management), it does not serve as a connection within the same transportation system, but rather between different systems. So, answer A is the correct choice because a roadway is an element that directly connects to other transportation components like parking structures, forming a cohesive network within the transportation system.