Which institute did Einstein join for higher studies?

Correct answer: Polytechnic in Zurich

Einstein joined the Polytechnic in Zurich for higher studies, so option A is correct. The institution, located in Switzerland, was important in his academic development and is connected with his study of scientific subjects. The question asks specifically about the institute he attended for higher education, not about a later workplace or a famous university that is unrelated to the lesson. Oxford and Harvard are well-known institutions, but neither is the answer given in this biography. Delhi University is also historically and geographically unrelated to this episode. Remember the useful link: Einstein’s higher studies were at the Zurich Polytechnic, while his later job at the Swiss Patent Office was in Bern. Keeping these two places separate prevents confusion in factual questions.