What are comment lines in a program?

• A. Instructions for the robot to follow a line
• B. Instructions written in English that are notes for a programmer
• C. Lines that indicate where the robot is to pause
• D. Commands given to the robot to tell it what to do

Answer: (B)

Comment lines are human-readable notes embedded in code that explain what the code does. They’re meant for programmers to understand intent, logic, or decisions behind the implementation, not for the robot to execute. Because they’re comments, the computer ignores them during execution, so they don’t affect how the program runs. In many languages, comments use a special syntax like //, #, or /* … */ to mark them, but the key idea is that they’re documentation within the code, not instructions for the robot. This is why the best description is lines written in English that are notes for a programmer. The other kinds of lines describe actual actions the robot should take, such as following a line, pausing, or issuing a specific command, which is why they aren’t comments.