单项选择题

A. XmlElement root = doc.DocumentElement;XmlNodeList nodes = root.SelectNodes(“.”);
B. XmlElement root = doc.DocumentElement;XmlNodeList nodes = root.SelectNodes(“book”);
C. XmlElement root = doc.DocumentElement; XmlNodeList nodes =root.SelectNodes(“bookstore//book”);
D. XmlElement root = doc.DocumentElement; XmlNodeList nodes =root.SelectNodes(“books/book”);