To interpret research data and arrive at useful recommendations , researchers return to the original research question and ?
a. secondary data
b. primary data
c. marketing problem
d. focus groups

C. Marketing Problem

Explanation:

I have no explanation, but it’s APEX verified :)

answer; drop shippers;

answer; ///(d); determining who competes most closely   with whom evaluating whether industry driving forces and competitive pressure favor some strategic groups and hurt others, and ascertaining whether the profit potential of different strategic groups varies due to the strengths and weaknesses in each groups respective market positions;