Which of the following refers to an obligation for which one is accountable?

The correct choice is Responsibility because it encapsulates the idea of being accountable for certain actions or obligations. Responsibility involves recognizing what is required of an individual in a specific context, whether that be in a professional, personal, or academic setting. It suggests a degree of ownership and the expectation that tasks or duties will be completed or managed appropriately.

In contrast, while 'Duty' relates to a moral or legal obligation, it does not inherently carry the same connotation of accountability that 'Responsibility' does. 'Liability' refers more to the legal aspect of accountability, often in terms of financial obligations or risks associated with negligence. 'Task' pertains to specific activities or assignments but does not encompass the broader obligation of accountability. Thus, Responsibility is the most accurate term for expressing an obligation for which one is accountable.