Select the most appropriate option that can substitute the highlighted words in the given sentence.
It's not polite to blow your own trumpet in front of others.

Correct option is A

Option (a) is the correct meaning of the given idiom.
Idiom: Blow your own trumpet – It means to praise oneself or brag about one’s achievements. (अपनी प्रशंसा स्वयं करना)
Example: He keeps blowing his own trumpet about how successful he is.
Other related idioms and their meanings:
Pat oneself on the back – To praise or congratulate oneself for an achievement. (अपनी पीठ थपथपाना / ख़ुश होकर अपनी तारीफ़ करना)
Sing one’s own praises – To boast or speak highly about oneself. (अपनी तारीफ़ करना)
Talk oneself up – To promote or exaggerate one’s own qualities or achievements. (खुद को ऊँचा दिखाना)