20pts! answer with details! ! : )

how can understanding body language people communicate better?

Understanding body language can help you deduce how the person is feeling towards your conversations/statements. I'll use an easy one as an example: Flirting. Let's say a boy is talking to a girl and she's twirling her hair and biting her lip. That usually means that she's into him but if the boy doesn't know body language, he won't know that

Body language is one of the most used types of communication on earth ,and anybody can read it to a certain degree, so. lets say someone is angry... people can tell that person is angry by their body language, (or the vibe they're giving off. but still.) 

Are those the answer choices ?