Please answer the following question by reasoning step-by-step.
One of the following sentences is nonsensical. Which one is it?\nOptions:\n- Sentence A: "My mother's hair is gray, unless she dyes it brown."\n- Sentence B: "My mother's eyes are gray, unless she dies them brown."\n

Sentence B
You can't dye your eyes a different color.

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So, the final answer is Sentence B