What kind of vote takes place most often in America for deciding the winner of a single-member district?

Which statement explains why a candidate for office in the United States would find the issue of abortion politically challenging?

a. Supreme Court rulings protect abortion rights from political meddling. b. Catholics and Protestant fundamentalists are highly influential interest groups. c. Many Americans base their vote solely on a candidate's position on social issues. d. American voters who support abortion rights are also likely to oppose same-sex marriage.

The major premise is presented in which of the following forms?

A. if P, then Q B. P C. Q D. therefore, Q