What did Einstein continue while working at the Swiss Patent Office?

Correct answer: Thinking about scientific ideas

The governing idea is that a routine job does not necessarily end a person's intellectual or creative work. While Einstein worked as a technical examiner at the Swiss Patent Office in Bern, he continued thinking deeply about scientific problems and developing his ideas. This period was important because his private study and reflection contributed to major scientific work. Therefore, option A is correct: he continued thinking about scientific ideas. Options B, C, and D are unrelated to the biographical account; the lesson does not present sports, military training, or political speeches as his continuing activity at the office.