People from all walks of life, races, religions, and ethnic groups participate in the u. s. legislative process. in view of this, which term best describes american society?

In view of this america is best defines as a pluralistic society.  It discusses to a society and a system of government that has not the same groups that retain their identities while existing with other groups or more dominant group. Pluralism distinguishes a large number of challenging interest groups that share the power and work as a model of democracy where different groups can voice their judgement and thoughts.

The answer is c because the law is facts

An informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.