下列关于物质的组成、结构、性质及变化规律的总结，正确的是（　　）

A．H₂O、HCl、NaNO₃均由不同种元素组成，属于混合物

B．Fe、Fe²⁺、Fe³⁺三种微粒的质子数相同，化学性质也相同

C．浓H₂SO₄、NaOH都具有吸水性，故它们都能用来干燥二氧化碳气体

D．NH₄NO₃、（NH₄）₂SO₄、NH₄Cl殾能与NaOH反应，放出NH₃

Woman: I want to try something new in the project. What’s your opinion
Man: Well, I prefer to go by the book. At least it is safer, isn’t it
Question: What does the man suggest

A．Strictly obeying the established rules.
B．Trying something new from the book.
C．Testing a new but safer method.
D．Learning a new method through practice.