A random sample of 80 voters found that 44% were going to vote for a certain candidate. Find the 90% limit for the population proportion of voters who will vote for that candidate?
a. 39.4% < p < 48.6%
b. 34.9% < p < 53.1%
c. 35.9% < p < 52.1%
d. 36.9% < p < 51.1%