Answer:
B
Step-by-step explanation:
Comments in code are primarily used to describe what the program does, and how chunks of the code running the program help relate to what the program does. Comments in code are not primarily used for answers d & a, which is more code, since if you comment, the compiler doesn't notice the code, so it doesn't work. Comments in code are not used for c either, since it's not really needed to write that in the comments.