What does the idiom 'Speak your mind' mean?

Correct option is A

Option (a) is the correct meaning of the given idiom.
Given Idiom: Speak your mind — To express one’s honest thoughts and feelings openly, without hesitation or concealment; निर्भीकता से अपनी बात कहना, बेबाकी से अपनी राय रखना. It implies candour and straightforwardness.
Example: In our meetings, everyone is encouraged to speak their mind so that all viewpoints are heard.
Other related idioms and their meanings:
· Call a spade a spade: To speak plainly and directly; साफ़-साफ़ कहना.
· Come clean: To confess or speak honestly; सच-सच बताना.
· Wear one’s heart on one’s sleeve: To show feelings openly; भावनाएँ खुले तौर पर प्रकट करना.
· Get something off your chest: To express something that’s been worrying you; दिल का बोझ हल्का करना.