South African music and jazz music share several similarities, but in the context of your question, the best answers would be:
A) They both use improvisation - Improvisation is a key element in both South African music and jazz. Musicians often create spontaneous melodies and rhythms during performances.
D) They both use syncopation - Syncopation is a common rhythmic feature in both jazz and South African music, adding complexity and interest to the music.
While B) the use of world instruments can sometimes overlap, it may not be as universally applicable to both genres as the other choices. C) focusing on major keys is not specific to either genre, as both may utilize a variety of scales and tonalities.
In summary, A and D are the most relevant similarities.