Which of the following Agile Manifesto principles aligns with conducting a system demo?

The principle that aligns with conducting a system demo is that working software is the primary measure of progress. Conducting a system demo allows teams to showcase working increments of the product to stakeholders, providing tangible evidence of development progress. This visual representation of functionality helps to validate that the product is on the right path and addresses stakeholder needs, highlighting the importance of demonstrating completed work rather than relying solely on documentation or discussions.

While other principles, such as customer satisfaction and cooperation among stakeholders, are indeed important aspects of an Agile mindset, they don't specifically underline the emphasis on showcasing working software. Responding to change is also a critical principle but relates more to adapting to new information or requirements rather than demonstrating completed work. Overall, the focus on working software as a measure of progress directly connects to the purpose and outcome of system demos.