It  can  be  inferred from  the passage that ...

Câu hỏi: It  can  be  inferred from  the passage that  one reason  that  sociologists   may become frustrated  with  questionnaires is that             

A respondents are too eager to supplement questions with their own opinions

B respondents often do not complete and return questionnaires

C questionnaires are expensive and difficult to distribute

D questionnaires are often difficult to read