What rephrased version maintains the meaning of 'You won't succeed unless you try harder' using 'until'?

The choice that accurately rephrases the original sentence while utilizing 'until' is that you won't reach success until you put in more effort. This maintains the essence of the original statement, which emphasizes the need for increased effort as a prerequisite to achieving success.

Using 'until' implies that there is a condition that must be fulfilled before success can be attained, which aligns perfectly with the original message. The phrase indicates that success is contingent upon making a greater effort, thus preserving the idea that trying harder is necessary for achieving one's goals.

This rephrased version is particularly effective because it directly correlates the action of trying harder with the successful outcome, capturing the conditional relationship indicated in the original phrase.