In the last paragraph, the author refers to government contracts in the United States and the United Kingdom primarily in order to A. Cite two governments that often reserve the right to modify unilaterally contracts that they enter into with foreign investors. B. Support the assertion that there is no general principle of law governing contracts between private individuals and governments. C. Cast doubt on the alleged universality of the concept of administrative contracts. D. Provide examples of legal systems that might benefit from the concept of administrative contracts. E. Provide examples of characteristics that typically distinguish government contracts from private civil contracts.