Some news organizations maintain a database of customers who have volunteered to share their opinions on a variety of issues. Suppose that one of these databases includes 9000 registered voters in California. To measure the amount of support for a controversial ballot issue, 1000 registered voters in California are randomly selected from the database and asked their opinion. Which of the following is the largest population to which the results of this survey should be generalized?

a. The 1000 people in the sample

b. The 9000 registered voters from California in the database

c. All registered voters in California

d. All California residents

e. All registered voters in the United States

Select the best answer.