Mark the letter A,B,C or D indicate the world whose main stress position is placed differently from that of the other in each group

Mark the letter A,B,C or indicate the world whose main stress position is placed differently from that of the other in each group.                                                   3. A. commercial. B.temperature   C. simplicity D. courageous.                                  B.                                 
4. A. economic B. entertainment C. competition. D. technology
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