Read the excerpt from "Lessons of Dr. Martin Luther King, Jr."

The simple act of refusing to buy table grapes laced with pesticides is a powerful statement that the growers understand.

Economic pressure is the only language the growers speak, and they are beginning to listen.

Please, boycott table grapes. For your safety, for the workers, and for the children, we must act together.
This passage shows that one purpose of Chavez’s speech is
A. to persuade people to stop buying grapes treated with pesticides.
B. to tell people about the financial troubles of grape growers.
C. to urge people to learn more about ways to protect children.
D. to show people how growers and consumers can work together.

To determine the purpose of Chavez's speech, we need to analyze the information provided in the excerpt. The passage states that the simple act of refusing to buy table grapes laced with pesticides is a powerful statement that the growers understand. It also mentions economic pressure being the only language the growers speak and that they are beginning to listen. Lastly, Chavez urges people to boycott table grapes for safety, workers, and children.

Based on this information, we can conclude that the main purpose of Chavez's speech is A. to persuade people to stop buying grapes treated with pesticides. This is supported by the emphasis on boycotting table grapes as a form of economic pressure to bring about change and protect the safety of consumers, workers, and children.