Although Sanders voters are quite liberal, a lot of them aren't Democrats, or at least don't like to identify themselves as Democrats. Clinton crushed Sanders among self-identified Democrats, winning them by 27 percentage points, based on exit polls. But Sanders won independents who voted in the Democratic primary by 31 percentage points." Which of the following would improve Hillary Clinton's chances of winning the nomination?

a. Appealing more to self-identified Democrats
b. Attracting more liberal voters
c. Securing the support of non-Democratic Sanders voters
d. Winning among independent voters