Final answer:
The U.S. act that amended Title VII and gave the Equal Employment Opportunity Commission authority to 'back up' its administrative findings and conduct its own enforcement litigation is the Civil Rights Act of 1991 (b).
Step-by-step explanation:
The U.S. act that amended Title VII and gave the Equal Employment Opportunity Commission authority to 'back up' its administrative findings and conduct its own enforcement litigation is the Civil Rights Act of 1991 (b).