Mark the letter A, B, C or D that differs from the other three in the position of primary stress

Mark the letter A, B, C or D that differs from the other three in the position of primary stress  
4. A. no’madic    B. ‘generous    C. ‘colourful    D. ‘countryside
5. A. ap’pliance    B. opti’mistic    C. con’venient    D. ma’chinery