Correct option is C
Option (c) is the correct meaning of the given idiom.
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"Change of heart" means
to alter one’s opinion or attitude toward something. A person may initially believe something strongly but later feel differently about it.
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Example:
He was about to quit his job, but after discussing it with his mentor, he had a change of heart and decided to stay.
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Other related idioms:
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Have a change of mind – To reconsider or rethink something.
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Have second thoughts – To doubt a decision after making it.