The . . . . . . . . one uses while pronouncing a tag question could change the meaning of tag questions in spoken language.

Solution (By Examveda Team)

Intonation is the rise and fall of the voice pitch in speech. It's a key element in conveying meaning, especially in questions and statements.
Pitch refers to the highness or lowness of a sound. It's a component of intonation, but intonation encompasses more than just pitch.
Stress in speech refers to the emphasis given to a particular syllable or word within a sentence. It affects the meaning but not as directly as intonation.
Rhythm refers to the pattern of stressed and unstressed syllables in speech. While important for fluency and comprehension, it doesn't directly alter the meaning of tag questions in the same way intonation does.

The correct answer is A: intonation.
Tag questions are short questions added to the end of a statement to seek confirmation or agreement. The meaning of a tag question can dramatically change depending on whether the intonation rises (implying uncertainty or seeking information) or falls (implying a statement of fact or seeking confirmation of an already-held belief).
For example, consider the statement "It's a beautiful day, isn't it?"
If the intonation rises on "isn't it?", it's a genuine question seeking agreement.
If the intonation falls on "isn't it?", it's more of a statement seeking confirmation of an already-held belief (implying the speaker already thinks it is a beautiful day).
Neither rhythm, stress, nor pitch alone would produce this shift in meaning as powerfully as the change in intonation.