Answer: c) some firms have superior resources
Step-by-step explanation:
The resource based perspective aims to show that in an industry a company can make above average returns due to the superior resources it possesses that enables it to maintain a competitive advantage.
Some of these resources include people skills and technical know-how. For instance, a company might have better skilled computer programmers than others in the industry which will enable them produce better applications that they can use to corner the market.