Final answer:
a) Survey. Hannah should use a survey to collect quantitative data for her marketing research project.
Step-by-step explanation:
The best research method for Hannah's goal of collecting quantitative data for her new project would be a survey.
A survey is a structured interview in which respondents are all asked the same questions, and their answers are tabulated and interpreted. It is a reliable and efficient way to collect data from a large number of individuals or groups of people. Surveys are ideal for collecting quantitative data that can be replicated in a controlled environment, making them well-suited for Hannah's marketing research project.
SEO Keywords: quantitative data, research method, survey