Choose the option that best conveys the meaning of the underlined portion in the following sentence;

In the match against the uplanders team, the sub mariners turned out to be the dark horse

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Only the small fry gets punished for such social misdemeanours.

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He spoke with his heart in his mouth

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The leader in today's issue of our popular newspaper focuses on inflation

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From the ways my friend talks, you can see he is such a bore