A political party makes major ideological adjustments to its platform at a national convention, altering the party’s position to support single-payer universal health care. Which of the following would be the most likely to prompt this shift?

a changing public view of health care as a basic right in modern society
a political need to attract unaffiliated independent voters to win critical races
a rising public rejection of for-profit healthcare due to poor economic conditions
a political threat posed by a single-issue third-party campaign for universal health care