Which of the Following Results Were Found in a Series

Which of the following results were found in a series of interviews on agency-client relationships with executives from major Canadian marketers?

A) The agency and client should maintain an arm's length separation so as not to influence the creative process.
B) Marketers believe they can help agencies in the relationship by being better clients through clear decision-making and solid marketing research.
C) Clients should not share sensitive and confidential information with the agency in case the relationship sours.
D) Stronger results were more often delivered by full-service agencies than by smaller boutique firms.