I have a question that have 5 tags, and c is not one of them. Without c tag, the code block is colorless and harder to read. Other 5 tags are way more important than c tag, therefore I cannot replace any of them with c tag. But I also want the code to be colored. What must I do in this situation?
<!-- language: c --> before the code block.
That said, I find it highly unlikely that the other 5 tags are more important. Having an appropriate language tag is virtually always the most important tag for a question, as that's the window through which you'll get the majority of your potential answerers.