Who was Mileva Maric?

Correct answer: Einstein's classmate

Mileva Maric was Einstein’s classmate at the Zurich Polytechnic, so option A is correct. The chapter introduces her in connection with Einstein’s higher education and describes how their association developed during their student years. She was not presented as his school principal, because she studied alongside him rather than supervising him. She was also not his sister or doctor; those choices confuse personal or professional relationships that are not stated in the biography. Identifying her as a classmate is important because the lesson later explains that their friendship grew into marriage. Thus, the answer follows both the factual description and the sequence of events: they met as students, became friends, and later married. The phrase “at Zurich Polytechnic” provides the precise context needed.