Answer:
systematically
Step-by-step explanation:
Marketing research is a process in which the market researchers use specific methods to get information that allows them to generate a better understanding of the market. This requires the review of data to find sufficient information that is relevant for the topic. According to this, the answer is that to be effective, market researchers must systematically collect, record, analyze, and interpret data because systematically indicates that the process requires an orderly form to find all the information about a question and that is what market rearchers have to do.
The other options are not right because occasionally means sometimes and eventually means in the end and collect, record, analyze, and interpret data is a permanent part of researchers' job.
Intravenously means giving something through the vein which is not related to marketing research and randomly means without method and market researchers use methods to evaluate information.