Answer is Industry
Step-by-step explanation:
An industry is a group of companies whose primary business activities like production, marketing, procurement and product design are related. In order words, an industry is a group of companies that sells related goods and services to satisfy similar customer needs in a particular economy.
Since EZ Electronics Inc., Neo Digital Inc., and Techno Products Corp., are all grouped as manufacturers and sellers of consumer electronics, it describes their similarities, of which their relative attractiveness or consumer preference can be compared with each other. Therefore, they are a part of an industry.