This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to get a doctorate in history
Study history or a related subject at the undergraduate level.
It is best if you major in history. But, if you don't, then take as many history classes as you can.

Select from the following. A). If you're going to get a phd in history, you will need to pass some courses so that you are a chemist, you can do research. Most phd universities require phd students to either attend master's or master's classes. B). You can try learning a study of several topics and then at least a doctorate in something else. Take the great britain course on courses throughout secondary school and in past history. C). If you don't like history or history, then try to take a degree in a related field. For instance, if you love american history, and love french history, study french history. D). Vary your classes so that they cover a wide variety of topics and time periods. Take classes that require you to write substantial research papers.
The answer is:
D).