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B is corrent because the Age Discrimination in Employment Act generally applies to the employment of individuals at least 40 years old by businesses employing at least 20 people.
A is incorrect because the Age Discrimination in Employment Act generally applies to the employment of individuals at least 40 years old.
C is incorrect because the Age Discrimination in Employment Act generally applies to the employment of individuals at least 40 years old by businesses employing at least 20 people.
D is incorrect because the Age Discrimination in Employment Act generally applies to the employment of individuals by businesses employing at least 20 people.