Answer:
Secondary Data
Explanation:
Based on the information provided within the question it can be said that utilizing Secondary Data would definitely be the most effective type of data for this assignment. This is because this is data that is collected by other individuals and not the researcher. Therefore in this situation the data would be gathered from the individuals in each of the three cities, and since they are native to those cities the information they have gathered will be way more valuable than the information that the researcher can gather themselves.
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