题目内容：
阅读以上短文，回答题
Which of the following statements is the intended meaning of the last sentence in the second paragraph? __________
A The design, implementation, and evaluation of the marketing mix combine most part of a firm's marketing effort.
B The bulk of a firm's marketing effort consists of the design, implementation, and evaluation of the marketing mix.
C The design, implementation, and evaluation of the marketing mix are composed of most part of a firm's marketing effort.
D The bulk of a firm's marketing effort makes up the design, implementation, and evaluation of the marketing mix.
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答案解析：