Final answer:
Under Title VII, a legitimate criterion for Diamond Mining Inc. to select an employee is education, while age, gender, and race are not legitimate criteria.
Step-by-step explanation:
Under Title VII, a legitimate, nondiscriminatory criterion for Diamond Mining Inc. to select an employee can be education. Education is a relevant qualification for many job positions and selecting based on an applicant's education level is not discriminatory.
Age, gender, and race are not legitimate criteria for selection as they fall under protected classes. Discrimination based on these factors is prohibited by Title VII of the Civil Rights Act.