Susie wants to determine the percentage of people in the United States that have a college degree. She conducts an email survey of 150 people randomly selecting three people from each state. Seventy-five of the people surveyed have a college degree. Based on the survey, Susie concluded that 50% of the people in the United States have a college degree. Select the statement that is true about Susie's conclusion.
A.
Susie's conclusion is not valid because the sample was random.
B.
Susie's conclusion is valid because the sample was biased since all the people were from one state.
C.
Susie's conclusion is not valid because the sample was biased since all the people were from one state.
D.
Susie's conclusion is valid because the sample was random.