Read this passage from “The Einstein Theory of Relativity” by H. A. Lorentz. Whether it is true or not that not more than twelve persons in all the world are able to understand Einstein's Theory, it is nevertheless a fact that there is a constant demand for information about this much-debated topic of relativity. The books published on the subject are so technical that only a person trained in pure physics and higher mathematics is able to fully understand them. In order to make a popular explanation of this far-reaching theory available, the present book is published. What is true about the main idea of this paragraph?

A. The main idea is stated: This book is being published to provide a popular explanation of the Theory of Relativity.

B. The main idea is stated: No more than 12 people in the world can understand Albert Einstein’s Theory of Relativity.

C. The main idea is implied: There is too much demand for an explanation of the Theory of Relativity.

D. The main idea is implied: The books published about Einstein’s Theory of Relativity are hard to understand for most people.