Correct option is D
The correct answer is
(d) breakthrough.
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Explanation: A "breakthrough" refers to an important and sudden advance, particularly in knowledge or achievement.
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Breakthrough (Hindi meaning): बड़ी सफलता या उपलब्धि.
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Example: The new discovery was a major breakthrough in cancer research.
Meanings of other options:
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Break-in: Forced entry into a place (तोड़-फोड़ कर प्रवेश करना).
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Breakaway: Separation or secession (अलग हो जाना).
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Break up: To end a relationship or partnership (विभाजन).