What was the reaction to the murder of Martin Luther King, Jr. in America?
A. The March on Washington took place.
B. Riots in over 100 U. S. cities occurred.
C. President Johnson launched an investigation.
D. U. S. troops withdrew from Vietnam.

The March on Washington took place.

Explanation:

an interest group is an organization whose members share common concerns, and try to influence government policies that impact those concerns. elected officials frequently complain about the influence of "special interests" on american politics.