Concept:Commercial law is the branch of law that governs business and commercial transactions.
Explanation:Rules and regulations that guide how businesses deal with one another are called commercial law.
This area is also known as business law or mercantile law.
It covers important matters such as contracts, sales, and fair trading practices.
Criminal law deals with offences against the state, not business transactions.
Common law refers to law developed through court decisions.
Contract law only covers agreements, which is narrower than all business dealings.
Therefore, the best answer is commercial law.
Answer:D. commercial