Charmaine Had Been Asked by Her Company to Develop a Better

Charmaine had been asked by her company to develop a better understanding of the market potential for plasma TVs in Russia. Charmaine decided to conduct a small intercept survey and designed her own questionnaire. One of the questions asked was: 'How much money do you make each month?' Charmaine found, however, that only 0.25% of respondents were willing to answer that question. The most likely reason for the low response rate is:

A) The sample size was too small
B) Conjoint variables should have been used
C) The question should have been asked indirectly
D) A realism check question was needed