...a topic that interests you and will hold your attention.
It'll make the research process more enjoyable.
Image source: US Dept. Agriculture. CC BY 2.0. Wikimedia Commons.
Before selecting a topic or starting your research, make sure you understand the assignment and its requirements.
Consider the following:
Always clarify questions you may have with your professor.
Can’t think of a topic to research?
Image source: Train stuck in snow. 1881. Elmer and Tenney. Public Domain. Wikimedia Commons.