Which one of the following best states the author's main conclusion in the passage? A. Providing that an international agreement be governed by general principles of law is not a viable method of guaranteeing the legal security of such an agreement. B. French law regarding contracts is significantly different from those in the United States and the United Kingdom. C. Contracts between governments and private investors in most nations are governed by ordinary contract law. D. An inherent power of a government to modify or terminate a contract cannot be considered a general principle of law. E. Contracts between governments and private investors can be secured only by reliance on general principles of law.