답변을 얻은 뒤 반드시 감사의 덧글을 남기고, 좋은 답변은 채택해 주시는 센스...
질문할 때 예의를 지키시기 바랍니다.(빨리... 고수분만..... 이런 식의 요구는 자제 바랍니다.)
질문 내용 :

이지문의 전반적 내용은 역사에서의 아마추어의 공헌 정도가 되는데요

In today’s highly professionalized world, the term amateur invites rejection from business executives and economists. Yet throughout history, unpaid amateurs, (A) [worked / working] for themselves, their families or their communities, have made remarkable achievements in a wide variety of fields, including science and technology. Because science had not yet become a paying profession, early scientists were almost all amateurs. Many gained a living as paid professionals in one field but made (B) [his / their] greatest contributions to history as amateurs.
Benjamin Franklin, as a politician, studied ocean currents on the side and demonstrated that lightning was a form of electricity. Pierre de Fermat, (C) [who / whose] ‘last theorem’ puzzled mathematicians for centuries, was a lawyer. 위문장에서 on the side부분이 해설지에는 가장자리의 해류를 연구했다라고 나와있는데

가장자리보다는 부업으로 가 더 맞지않나요? 그러니까 벤자민프랭클린은 정치가였지만 부업으로(아마추어로서) 해류도 연구했다.. 이렇게요.