4B or 4C Hair?

I am really confused at this point. Is my hair really a 4B or 4C? See that is exactly why I guess a lot of ladies do not go by that darn hair chart. One minute my hair will look like a str8 up 4C and the next it will look like a 4B. So at this point I will just go with saying I have 4B/C hair. But I do believe my hair is mainly 4C. See! See how confused I am? LOL. Look at the post below this one and you can't tell me my hair doesn't look 4C! But in THIS picture on this post it looks 4B compared with this chick on the left.