Final answer:
Companies with insular, inwardly focused cultures usually believe they have all the answers because of their past great market success.
Step-by-step explanation:
In companies with insular, inwardly focused cultures, they usually believe they have all the answers because of their past great market success. They are resistant to change and prefer to stay within their own ideas and perspectives. This can lead to a lack of innovation and an inability to adapt to new trends or customer needs. Therefore, the correct answer is option a.