I'll give you a question, please answer with step-by-step reasoning process.
When people social at a bar, the bartender will often do what to the cocktails they serve?\nOptions:\n- meet people\n- have friends\n- mix\n- with people\n- see people

mix
The drink is to be mixed before serving.

When people gets socialize at a bar, the bartender will often mix the cocktails that they serve.

.

The final answer: mix