Final answer:
Democratic victories, evangelical church attendance, and cultural liberalism in public schools all contributed to the growth of grassroots conservatism in postwar Southern California. Option d. is correct.
Step-by-step explanation:
In postwar Southern California, the growth of grassroots conservatism can be attributed to a combination of factors. Democratic victories in state elections, the expansion of evangelical church attendance, and fears of cultural liberalism in public schools all contributed to the rise of grassroots conservatism.
Southern Democrats, who had initially supported the federal government's authority for economic redistribution, began to resist calls for those powers to be used to restructure society. This led to a shift in their allegiance to the Republican Party, which advocated for smaller national government and greater states' rights. Additionally, Ronald Reagan's presidency in the 1980s further solidified the conservative movement and its goals, including the opposition to abortion, welfare, and affirmative action.