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Which one of the following is relatively the most important source of International Law?

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Treaties are increasingly used to codify even the existing customary international laws, making them the most reliable source for international litigation.
Updated On: Jun 5, 2026
  • Judicial Decision
  • Treaties
  • Custom
  • The general principles of Law
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The Correct Option is B

Solution and Explanation

Step 1: Read the question.
Which is the most important source of International Law in modern times?

Step 2: Recall the sources.
Article 38 of the ICJ Statute lists treaties, custom, general principles of law, and judicial decisions and writings.

Step 3: Compare the main sources.
Custom is old and unwritten, based on long state practice. Treaties are written agreements that clearly state the obligations of each state.

Step 4: Decide which is most important now.
Today treaties are seen as the most precise and widely accepted source because they create clear, binding written rules.

Step 5: Eliminate the others.
Judicial decisions and general principles are only supporting sources, not the primary one.

Step 6: Conclude.
The most important source is treaties.

Answer: Treaties
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