Answer:
D. secondary
Explanation:
According to my study on different types of research methods, I can say that based on the information provided within the question this would typically be a secondary research. This is because a secondary research is defined as gathering information from another source or environment that was not created by the researcher and is only observed. Which is what Danielle is doing since she is just observing the women go into another store and gathering the information of how many plus-size women walk out.
I hope this answered your question. If you have any more questions feel free to ask away at Brainly.