【单选题】Which of the following is the best example in which to apply causal research?
A.
the Andrew Jergens Company periodically conducting surveys to measure consumer's perceptions, attitudes and use of soap bars and related personal care products
B.
to determine the relationship between sales promotion and advertising expenditures and sales of Mercedes
C.
to gain insights on why Nokia is losing market share in Asia
D.
to understand how consumers evaluate the Home Depot brand compared to competing brands
E.
one-on-one depth interviews matching respondents and interviewers by gender