To best test your hypothesis, the most appropriate option would be:
Find other people born in the same week and ask them what their favorite type of movie is.
This approach directly assesses the preference of others born during the same week, allowing you to gather data that could support or refute your hypothesis about a possible correlation between being born in a particular week and movie preferences. It avoids biases that may arise from personal opinions or recommendations and focuses on collecting objective data regarding their preferences.