Final answer:
The word that best completes the sentence is 'pungent'.
Step-by-step explanation:
The word that best completes this sentence is B. PUNGENT. Pungent refers to a strong and unpleasant smell or odor. In the given sentence, the aroma of the bathroom is described as making the person realize that they could hold their urge until reaching the next gas station. This suggests that the smell was strong enough to evoke a reaction in the person. Therefore, pungent is the most suitable word to complete the sentence.
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