Which characteristic is essential for human-readable instructions?

The correct answer highlights that common images of the solution contribute significantly to making instructions human-readable. Visual representations can simplify complex information, making it easier for individuals to grasp the content quickly and effectively. When people can relate to common images or diagrams, they are better able to visualize processes or concepts being described. This approach enhances understanding, particularly for those who might not be familiar with technical jargon or specific terminologies.

The other options, while they address different aspects of instruction, do not specifically enhance the overall readability and clarity that visuals provide. Using a specialized programming language can hinder comprehension for individuals without a technical background. Assuming no prior knowledge is generally good for accessibility but does not directly affect the readability of the instructions themselves. Additionally, a lack of a clear path from start to finish actually complicates understanding rather than facilitating it. Thus, incorporating common images plays a pivotal role in ensuring that instructions are approachable and easily understood by a wider audience.