Choose the letter the word that has the underlined part different from others

IV- Choose the letter A, B, C or D the word that has the underlined part different from others.
Question 1: A. badminton         B. volleyball             C. basketball                D. gymnastics
Question 2: A. judo                   B. marathon              C. pole                         D. most
Question 3: A. regard                B. jacket                    C. athletics                  D. racket
Question 4: A. skiing                 B. ring                       C. tennis                      D. fighting
Question 5: A. rate                    B. marathon              C. skate                       D. congratulate
Question 6: A. fond                   B. goggles                C. congratulations       D. competition
Question 7:A. ice                     B. swim                      C. javelin                    D. cycling
Question 8:A. baseball             B. fantastic                 C. race                        D. skate
Question 9:A. athlete                B. think                      C. birth                        D. these
Question 10:A. these                  B. house                   C. horse                        D. increase