The author's report on how the social class of buyers influences the success of marketing strategies contained no exact and several imprecise and different definitions of social class.
(A)contained no exact and several imprecise and different definitions of social class
(B)contained no exact but varing imprecise and different definitions of social class
(C)contained no exact definition but several imprecise and different characterizations of social class
(D)failed to contain any exact definitions of social class, but varing imprecise and different ones
(E)failed to defined social class in any exact way but used varing imprecise and different ones
answer:C
想請問一下此提到底要從何分析起啊