<span> of one mind; in complete agreement; agreed.</span>
Even though you didn't give us the fragment with the comma slice, it isn't really necessary here as we can answer just based on these 4 options here. All options apart from the second one are correct - only the second option doesn't fix the mistake of the comma splice, whereas the other options do but connecting the sentences properly.
Nonrestrictive adjective clauses are the types of adjectives. The sentence that uses the nonrestrictive adjective clause is, about the sandwich that became soggy.
<h3>What is a nonrestrictive adjective clause?</h3>
A nonrestrictive adjective clause is the part of the sentence that is added as extra information and is separated by the commas.
The removal of these words does not change the meaning of the sentence and does not have much influence and effect on the sentence when omitted.
Therefore, option A. which had been prepared hours earlier uses a nonrestrictive adjective.
Learn more about nonrestrictive adjectives here:
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