What type of circuit contains only one pathway for current?

A series circuit is the correct answer because it is defined by having a single pathway through which current can flow. In a series arrangement, all components are connected end-to-end, forming a continuous loop. This means that the current flowing through each component is the same, and if one component fails or is removed, the entire circuit is interrupted and the current stops flowing.

In contrast, a parallel circuit consists of multiple pathways for current, allowing the current to find alternative routes if one part of the circuit is interrupted. An open circuit refers to a situation where the pathway is broken or incomplete, resulting in no current flow, but does not describe the number of pathways. A short circuit occurs when a low-resistance pathway is inadvertently created, allowing for excessive current to flow, which also does not correspond to the definition of a single pathway for current flow. Thus, the unique characteristic of a series circuit is its singular pathway, which directly leads to its designation as the correct answer.