Read this excerpt from "The Negro Speaks of Rivers" by Langston Hughes. I've known rivers:
I've known rivers ancient as the world and older than the flow of human blood in human veins.
What does the speaker allude to in this excerpt?
the rivers from his childhood
the survival of his people
rivers as old as civilization itself
the bloodshed from the Civil War

Interest groups representing businesses and investors are often among the most successful lobbying groups for all of the following reasons, except a. such groups have the financial resources to mount sustained campaigns on their own behalf b. these groups' members contribute heavily to many legislators' campaigns and in so doing gain greater access to legislators c. these groups have often been in existence for decades, allowing them to both master the legislative system and develop close ties with legislators d. the members of these groups make up the majority of voters in many districts