In a random sample of 1500 voters from the state of New York, 670 identified themselves as Democrats, 580 identified themselves as Republicans, and 250 identified themselves as Independents. Of the Democrats, 495 stated that they disapprove of the current president. The similar numbers for the Republicans and the Independents are 265 and 145, respectively. Let p1 be the proportion of all Democrat and Independent voters in New York who disapprove of the current president, and define p2 similarly for the Republicans. The endpoints of a 95% confidence interval for p1-p2 are closest to which of the following? a. 0.050 to 0.196 b. 0.235 to 0.329 c. 0.188 to 0.289 d. 0.197 to 0.281