The correct answer is "show your emotions." We use the phrase "wear your heart on your sleeve" in a casual way to say that we are showing our intimate emotions honestly and openly. It's likely that the phrase "wear your heart on your sleeve" comes from medieval jousts, where a 'sleeve' referred to a piece of armor that covered and protected the arm. Knights would often wear a lady's token around their sleeve of armor. Interestingly, the first recorded use of the expression can be found in William Shakespeare’s Othello.

Source: Merriam-Webster