Hi, C is indeed correct. You're right that it's not something we'd tend to say in casual conversation. It's more careful English, and even sounds a bit literary, so it would be more likely to be found in quite formal writing.
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therjwyep that doesn't sound right, the correct way would be:-No, this creates a comma splice, in which two independent clauses are inco
(A) The weather "was" nice, we decided to go hiking..
This is because we are speaking in past tense so the word would be "was".