In the Civil Rights Cases, the Supreme Court ruled that Question 5 options: a) Congress may regulate private conduct under the 13th, 14th, and 15th Amendments. b) Congress may not regulate private conduct under the 13th, 14th, and 15th Amendments. c) Congress may regulate private conduct under the 13th and 14th Amendments. d) Congress may regulate private conduct under the 13th Amendment, and government action under the 14th Amendment