Difficult Animal Volunteer Interest14/20Pick out the word that has the primary stress different from that of the other words.DifficultAnimalVolunteerInterestGiải thíchĐáp án CĐáp án A /ˈdɪf.ɪ.kəlt/Đáp án B /ˈæn.ɪ.məl/Đáp án C /ˌvɒl.ənˈtɪər/Đáp án D /ˈɪn.trəst/