Final answer:
Posco likely provides better service than Campbell as it encourages customer interaction and provides help with purchasing decisions, contrary to Campbell's mediocre service.
Step-by-step explanation:
Based on the scenario provided, the most likely true statement is that Posco offers better service than Campbell. This is evident from the fact that Posco is known for encouraging customers to ask questions and provides service representatives to help customers with their purchasing decisions, whereas Campbell's service is described as 'fairly mediocre' despite its surprise offerings of seconds, overstocks, and closeouts.
A key aspect of customer service in retail is the ability to interact with knowledgeable staff who can assist with purchases, an area where Posco appears to excel.