Atoy manufacturer conducted a survey to estimate the market demand for its specialized wood-based toys in a foreign country. for the survey, it interviewed all the families in four rural towns of that country but it did not have sufficient information to make the distinction between those with children and those without children. the market demand forecast based on this survey failed to match the actual demand for the toys. which of the following is the most likely reason for this failure?

a. difficulty in defining the research objective
b. unwillingness of the respondents to reply to survey questions
c. difficulty in translating the responses
d. inappropriate sample selection due to lack of adequate demographic data
e. lack of appropriate methods for analyzing the data