Which of the Following Statements About the Propagation Steps in the Chlorination

Multiple Choice

Which of the following statements about the propagation steps in the chlorination of ethane is true?

A) Radical chlorination consists of two propagation steps.
B) The energy diagram for the propagation steps has three energy barriers.
C) The first of the propagation steps is rate-determining because its transition state is at lower energy.
D) The second of the propagation steps is rate-determining because its transition state is at higher energy.