The second-largest number of PACs are those associated with single-issue groups, which include environmental groups and right-to-life groups. Thus, the correct answer is A.
PAC stands for the term political action committee, which refers to a group of politicians that combine their member's campaign contributions and use them to support or oppose the legislation and voting laws.
These PACs are associated with single issue groups, which include environmental groups that support right-to-life groups.
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