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Read the Following Scenario and Answer the Question Below

question 15

Multiple Choice

Read the following scenario and answer the question below.
Thousands of young families moved "over the hills" and into the San Fernando Valley, a suburb of Los Angeles, after World War II. New neighborhoods were springing up, replacing orange groves and open space; roads and schools quickly sprang into existence, trying to keep pace with the rapid population growth. Ringed by beautiful mountains, the entire Los Angeles basin looked like a new, green, sun- filled paradise to the families seeking a fresh start. In the early 1950s, one of the common family chores in Los Angeles was to carry the trash out to the stone incinerator behind the garage where each family burned all of their dry trash. "Wet" garbage was collected and taken to a city dump, where it was burned by the city. Everyone throughout the city either used an incinerator or burned things in an open trash pile; there were over 400,000 backyard trash incinerators. On warm afternoons, eyes would sometimes sting and burn. People would stop, close their eyes, and let the cleansing tears refresh irritated eyes. They accepted this as a normal part of life in sunny California.
-_______________ is a device designed to remove airborne pollutants from smokestack emissions.

Definitions:

Sympathy Strike

A work stoppage by workers in one industry intended to show support for striking workers in a different industry or company.

NLRA

A key piece of legislation in US labor law, the National Labor Relations Act establishes the rights of workers to unionize and negotiate collectively with their employers.

Mandatory

Refers to something required or obligatory by law or rule.

Permissive

Characterized by or allowing a lot of freedom and flexibility; not strict in the imposition of rules.