Answer:
4. Being a friend means being respectful, fair, interested, trustworthy, honest, caring, and kind.
Explanation:
When someone is holding a speech, they need to pay attention to what their audience is like. The tone a speaker will use will not be the same when they're speaking to an audience that consists of scientists and one that consists of high school students.
Students mostly use informal language. Informal language is more casual, spontaneous, and personal than formal language, which is always carefully thought out and mostly used in a professional or academic setting.
The sentence that uses informal language is the fourth one. The vocabulary and sentence structure are simple and similar to what we would hear in everyday situations, which is typical for informal language.
