Of the 250 students in a blind taste test, 150 (60%) preferred Milwaukee's Best over Natural Light. Then the 90% confidence interval for the student population proportion preferring Milwaukee's Best is:
a) 59.7% to 60.3%
b) 54.9% to 65.1%.
c) 59.8% to 60.2%.
d) 56.9% to 63.1%.