Fairytale Brownies Included a Survey Card on the Back of a Postage-Paid

Fairytale Brownies included a survey card on the back of a postage-paid reply card in each package of its brownies. The bakery asked open-ended questions. What potential problem might the use of open-ended questions create?

A) information overload
B) a lower level of cooperation from brownie buyers
C) more people would respond than needed
D) sample respondents would think the questions too easy
E) "yes" or "no" questions do not show exact motivations or feelings