Sonya Diaz is organizing marketing research in Brazil for a large American corporation that is int erested in expanding its market. The survey Sonya is using was written in English and then translated into Portuguese for use by Portuguese-speaking respondents. Which of the following is it ost important for Sonya do before administering this questionnaire to a sample of the market? a) have the questionnaire translated back into English to check for accuracy b) make sure that the survey includes both open-ended and closed-ended questions. c) decide whether to focus on primary or secundary data d) determine which type of research instrument to use e) determine whether to focus on descriptive or casual objectives.