Answer:
C. They defined moral behavior in a way that significantly influenced
modern legal systems.
Step-by-step explanation:
From the available options, the statement that best explains the importance of the Ten Commandments is "They defined moral behavior in a way that significantly influences modern legal systems."
This is evident in some of the ten commandments in which are still in the modern legal system, such as "thou shall not kill." "Thou shall not steal" and many others.