A Government Report Gives a 99% Confidence Interval for the Proportion

Multiple Choice

A government report gives a 99% confidence interval for the proportion of welfare recipients who have been receiving welfare benefits for more than 5 years to be 21% ± 4.5%.Which of the following intervals could not be a 95% confidence interval for the proportion of welfare recipients who have been receiving welfare benefits for more than 5 years?

A) 21% ± 4.2%
B) 21% ± 3.76%
C) 21% ± 3.9%
D) 21% ± 4.8%