阅读下列材料，从每题所给的A、B、C三个选项中，选出最佳选项。
The scientific method is used for simple experiments that students may do in the classroom or very difficult experiments that scientists are doing all over the world. It is a way of thinking that helps you to avoid (避免)drawing incorrect conclusions（结论).
There are usually four steps in the scientific method, including observation (观察), hypothesis (假设), experiment, and conclusion. The steps may not always be completed in the same order, but the first step is usually observation and asking a question about your observation. For example, you had a sick stomach, and ate a candy. An hour later, you observed that you felt much better. Here, you can ask a question, such as, "What makes a sick stomach feel better?"
The second step is to state a possible answer to the question, or a hypothesis, such as "
" A good hypothesis includes three things: The explanation for the observations, it is able to be tested, and it will usually predict new results or conclusions.
The third step is the experiment, to test the hypothesis. An experiment is a test which will either challenge or support the hypothesis. The hypothesis will then be true or false.
The final step is to think about what happened when you tested the hypothesis and draw a conclusion. The conclusion will either clearly support the hypothesis or it will not. If the results support the hypothesis, a conclusion can be written and you can share it with the rest of the world. If it does not support the hypothesis, you may choose to change the hypothesis or write a new one based on what was learned during the experiment.
