The answer to this question is Surveys
Survey is the data collecting method that easy to be done because it collect informations from wide variety group of people, especialy after the development of internet. Not only that, these type of data usually could target questions that usually private and unable to be told in public.
B. They loan out and invest the money that has been deposited.
The answer is 80%. hope it helps
I think the answer is B. hope this helped