Here is a goal: How can you tell if you are interrupting someone's conversation in an unwanted way?

Which way makes more sense to accomplish this goal?

Choices: i. When you approach a group of people while in a conversation, pay attention to their bodies. If they turn only their torsos and not their feet, it means they are in the middle of an important conversation and they don't want you to interrupt them. ii. When you approach a group of people while in a conversation, pay attention to their bodies. If they turn only their hair and not their feet, it means they are in the middle of an important conversation and they don't want you to interrupt them.
i.