Final answer:
The most appropriate law for Peter to sue his company for discrimination would be the Age Discrimination in Employment Act of 1967 (ADEA).
Step-by-step explanation:
The most appropriate law for Peter to sue his company for discrimination would be the Age Discrimination in Employment Act of 1967 (option b).
This law prohibits employers from discriminating against individuals who are 40 years of age or older in the hiring, firing, compensation, and other aspects of employment. Since Peter is 58 years old and he believes he is being laid off due to his age, this law would be the most relevant in his situation.
If Peter decides to pursue legal action, he may file a complaint with the U.S. Equal Employment Opportunity Commission (EEOC) to initiate an investigation against his employer for violation of the Age Discrimination in Employment Act.