Test Can You Fake It? How to Detect Inconsistencies in Body Language

QUESTION 1: What is the clearest way to detect a falsehood according to the text?

Because most people don't know what gestures to fake
Because it is almost impossible to manage the multitude of microexpressions and involuntary physiological reactions
Why do people forget to keep their posture upright after a while?
Because pretending requires too much mental energy and tires quickly

In the verbal message, since it is more conscious
In neither case is the situation ambiguous
In the non-verbal channel, since it is a more reliable indicator of true feelings
At the first signal that has been emitted, whether verbal or non-verbal