Correct option is A
Option (a) is the correct meaning of the idiom.
Wear your heart on your sleeve: To express emotions freely and openly. (अपने भावनाओं को सबके सामने व्यक्त करना)
Example: She wears her heart on her sleeve, so it’s easy to know what she feels.
Other idioms:
·
Bottle up emotions – Keep feelings hidden.
·
Cry one’s heart out – To cry a lot.