[单选题]William Wrigley Jr.,the American chewing gum tycoon,once noted that business is built by men who disagree,and that"When two men always agree,one of them is unnecessary."1,notjust in business but also in politics,sports,and the arts,there is no 2 0f real-world examples of successful partnerships that were fueled as much by the 3 0f ideas as by creative tension or discord.Scientific research shows that creativity and innovation can be 4 by reducing team harmony.For instance,a recent study of 100 product development teams found that two common 5 0f team harmony,namely diversity and task uncertainty,were positively 6 with creative performance.7,a review of theoretical and quantitative studies showed that teams are often more creative 8 they have f ewer rather than more resources.Furthermore,teams that are able t0 9 productive task conflict-expressing disagreements,negotiating between different views,and working under a certain amount of tension 10 to be more innovative,11,when teams and organizations enjoy too much harmony,they will gravitate 12 inaction and complacency,13,as Clayton Christensen noted,will 14 decline and extinction.From Kodak to Blackberry to Blockbuster,business schools are spoiled for choice when it comes to examples of dominant market players that were discarded from the top 15 their complacency.Success and happiness pose a bigger threat to businesses than a moderate 16 0f dissatisfaction.Being happy with the status quo is a 17 way to escape creativity.Any significant innovation in the history of civilization was the 18 of dissatis fied minds:people who were unhappy with the current order of things and 19 to destroy the 20 harmony. 13选？
A.sometimes
B.well
C.presumably
D.which