The correct revision for the provided sentence is option B, which includes the Oxford comma and the necessary conjunction.
The correct revision for the sentence is 'B. Liz, Anna, and Kris played in the snow, and it was a fun day of snowballs and sledding.' This revision properly uses the Oxford comma before 'and' to separate the list of names. It also adds the conjunction 'and' to connect the clauses correctly.
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