Which of the following is not a method to discover reasons for the thesis?（单选）

Which of the following is not a method to discover reasons for the thesis?（单选）
A、We can go back to the 5-step Decision Package to look for reasons.
B、We can use mind maps to find out reasons for a thesis.
C、We can reflect on how we come to the conclusion/thesis in the first place.
D、We can copy other people’s opinions.
正确答案：We can copy other people’s opinions.