Look at the graph. It shows the percentage of Americans who supported the Vietnam War in two public opinion polls. Which answer best describes the public reaction to the Tet Offensive? Public support for the war increased. Public opposition to the war increased. Little change in public opinion occurred after the Tet Offensive.

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