The option among the choices that corrects the comma splice found in the sentence is " It was the most destructive wildfire anyone could remember. There had not been any small fires to clear out the brush in many years." (option B)
A comma splice happens when we use a comma to join independent clauses. The correct punctuation would be a colon, a semicolon, or a comma followed by a coordinate conjunction. The comma used alone creates a comma splice.
One way to solve a comma splice is simply by placing a period or full stop between the clauses. That is what we have in option B, which is why we can select it as the best answer.
Options A and D are not necessarily incorrect, but they make use of subordinate conjunctions - "because" and "since" - rather than coordinate ones. Option C keeps the comma splice.
With that in mind, we can conclude option B is the correct answer for this question.
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