Final answer:
Random guessing is not a method of gathering good marketing intelligence, unlike surveys, competitor analysis, and customer feedback which are systematic and data-driven approaches.
Step-by-step explanation:
The method that is not a way of gathering good marketing intelligence is c) Random guessing.
Good marketing intelligence involves systematic gathering, recording, analyzing, and distributing data related to marketing strategies and customer preferences.
Methods such as surveys, competitor analysis, and customer feedback are legitimate ways to gather such information because they provide data based on the actual behavior and opinions of customers and analysis of competitors in the market.
Random guessing does not provide reliable data and therefore is not considered a valid method for obtaining marketing intelligence.