All of the Following Are Challenges Marketers Face When Conducting

All of the following are challenges marketers face when conducting marketing research EXCEPT:

A) Will consumers' actual purchase behaviors match their stated interests or intentions?
B) Will consumers reveal honest answers to questions about their personal hygiene habits?
C) Will consumers buy the same brand they say they will?
D) Will consumers accept a small gratuity for participating in a market research study for a new or existing product?
E) Will consumers really know whether they are likely to buy a new product that they have never thought about before?