His insistence on putting users first, and focusing on（）and simplicity, has become deep-rooted in his own company, and is spreading to rival firms too.

His insistence on putting users first, and focusing on（）and simplicity, has become deep-rooted in his own company, and is spreading to rival firms too.
A.elegant
B.delectable
C.delectability
D.elegance
正确答案：elegance