Correct option is C
The correct answer is
(c) of.
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Explanation: The correct preposition to indicate confidence about achieving something is "of."
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Confident of (Hindi meaning): किसी चीज़ को लेकर आश्वस्त होना.
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Example: She is confident of getting a promotion.
Meanings of other options:
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To: Indicates direction or result (की ओर).
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In: Indicates location or inclusion (में).
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Towards: Indicates direction or approach (की ओर).