ANSWER is option 1) i.e. a.In the part 'a' of the GIVEN SENTENCE 'company' has been used after 'many' which is wrong.Many shows that there are more than one company, so, plural form of company i.e. companies will be used here.So, the correct sentence will be: Alex had WORKED in many companies but he did not like it in any company because he was not following his passion, so, finally he quit his job and followed his passion.