The effectiveness of oral communication depends on the speaker’s ability to use :

The answer is A) Simple language. Oral communication is fleeting. The listener cannot re-read a sentence or pause the speaker, so the message has to land on first hearing. Simple words and clear structure make that possible.

• B) Long sentences: Wrong. Long sentences make the listener lose the thread, especially in a live setting. Short, well-built sentences work better when spoken.
• C) Foreign words: Wrong. Unfamiliar foreign words create a barrier unless the audience already knows them.
• D) Complex words: Wrong. Heavy vocabulary and jargon make the speech harder to follow. They can make a speaker sound impressive, but they do not make the communication effective.

The core concept is audience-centred communication, which is a basic part of the communication and ethics theme in GS-IV. For a civil servant addressing villagers, a press briefing or a public grievance meeting, the same principle applies: clarity is the test, not vocabulary.

Trap: Many aspirants pick D because they equate sophisticated vocabulary with competence. In oral communication, the listener's understanding is what counts, and that depends on simplicity.