GRE Text Completion: JiJing 1373-GRE填空机经1373题 - 889DHHLKQ3Y6YYXMA

The composer's string quartets exhibit a structural ____________ that seems to challenge the conventions of the string quartet genre, which have long been celebrated for their rigor and coherence. A. austerity B. restraint C. uncertainty D. ostentation E. vitality F. instability