Which major legal system makes the most significant use of court rulings as legal precedents?

A.
Common law

B.
Civil law

C.
Criminal law

D.
Customary law

Explanation:
Answer A is correct; common law emphasizes the role of court rulings to provide legal precedent. This emphasis allows for the interpretation of law to evolve over time with new judicial rulings.

Incorrect Answers and Explanations: B, C, and D: Answers B, C, and D are incorrect. Though Civil law commonly has a judicial branch, the core source of law is statutory. Criminal law is a subset of a major legal system rather than a major legal system itself. Customary law focuses more on the customs of a culture than the rulings of judges.