Answer:
research typically uses a variety of sources.
Explanation:
Conducting a research work means finding solutions or conducting a detail study on a particular topic or a problem. Many aspects of the problem has to be studies in order to achieve a proper solutions or a conclusions.
In doing research, many sources have to be used and studied properly. It is a detailed and careful study in finding solutions to a problem or an issue.
Various sources have to be studied in detail and every aspect of the source has to be consulted before obtaining a conclusion.
Thus the correct answer is "research typically uses a variety of sources".
