The answer is going to be D!
I would say the answer is specific
A topic sentence has many important duties to a paragraph.
A topic sentence must highlight the main idea of a paragraph, letting the reader know what the paragraph will be about. The topic sentence must present an idea that will unify the rest of the paragraph while relating it back to the main thesis of the paper.
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There are many research processes that can be followed according to the field of the research. However, we can usually think of a 5-step research process for general matters:
- Locating/defining the theme/problem or issue;
- Designing the project;
- Collecting data;
- Interpreting research data;
- Reporting research findings.
If following these steps, "creating notes of information he found so far" would belong to step 3: collecting data. Those notes must be neat and organized so that they will serve for consultation and even citation in the future. The analysis of the information noted is also important for the development of the research.