给出一个简单的英语语法问题并提供4个选项，让 GPT 模型选择正确的答案。

下列哪个选项是正确的被动语态？
A. The book was wrote by Mark Twain.
B. The book was writing by Mark Twain.
C. The book was written by Mark Twain.
D. The book was writed by Mark Twain.
选项 C. The book was written by Mark Twain.