Splicccccce?

Unsure that he was prepared for the championship boxing match, Carlos’s day off was spent practicing and refining his strategies.

I narrowed it down to
B) Carlos was unsure that he was prepared for the championship boxing match, he therefore spent his day off practicing and refining his strategies.
And,
C) Feeling unsure that he was prepared championship boxing match, Carlos spent his day off practicing and refining his strategies.

I see no error in either, is B a comma splice?

Exactly. B has two independent clauses linked by only a comma. That won’t do. Here’s a good thing to remember: “therefore” is not a conjunction. If you changed B to say, “…boxing match, so he spent his day…,” it wouldn’t be a run-on.

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