Answer:
Ginsburg then worked as a clerk for a U.S. District Judge for two years
Step-by-step explanation:
The correct way to write the sentence while being consistent with parallel writing is option B.
This is because, it clearly expresses the idea of Ginsburg working as a clerk for a U. S District Judge for two years without the use of words, phrases or punctuation marks that would bring ambiguity and change the meaning.