Answer:
A. Wide variations in capital structures exist both between industries and among individual firms within given industries. These differences are caused by differing business risks and also managerial attitudes.
Step-by-step explanation:
Put simply, all the other options aren't factual statements which lack reliability. However, it is generally accepted that not all companies would have the same capital structures (eg either equity capital or debt capital).
So, it is accurate to say that, wide variations in capital structures exist both between industries and among individual firms within given industries.