The correct answer is: D. no article
The reason is that the word “road” is a common noun, which means it refers to any road in general. In this case, Rachi is not entering a specific road, but rather any road that happens to be one-way. Therefore, we do not need to use an article.
The other options are incorrect because they would imply that Rachi is entering a specific road. For example, if we used article “a”, it would imply that Rachi is entering one road out of many possible roads. If we used article “an”, it would imply that Rachi is entering a road that is not a highway or a freeway. And if we used article “the”, it would imply that Rachi is entering a specific road that is known to the reader.
In conclusion, the correct answer is “no article” because Rachi is entering any road that happens to be one-way.