Early humans stopped moving around all the time because: A. they learned how to grow crops in one place.
B. they wanted to stop specializing in certain jobs.
C. they were often attacked by hunter-gatherers.
D. they wanted to live far away from dangerous rivers.

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