Which of the following guidelines will make code more explanatory for others?

Adding comments to the source code is a key practice for making code more explanatory for others. Comments serve as notes for anyone reading the code, providing context and clarifying the purpose of specific sections, functions, or logic behind certain decisions. This is particularly beneficial when the code is not immediately understandable or when it contains intricate logic that could confuse those unfamiliar with the implementation.

Effective commenting can explain the rationale behind choices, outline the flow of the program, and provide insight into any complicated algorithms being used. This enhances the readability and maintainability of the code, as it allows other developers (or even the original author at a later date) to quickly grasp what the code is intended to do without having to work through every line of logic.

While other practices can contribute to clearer code, comments specifically target the communication aspect, bridging the gap between programmer intent and code execution, making it easier for others to understand and collaborate on the codebase.