Which principle explains the phenomenon of diffraction?

• A. Principle of Simultaneity
• B. Pascal‚Äö√Ñ√∂‚àö√ë‚àö¬•s Principle
• C. Archimedes‚Äö√Ñ√∂‚àö√ë‚àö¬• Principle
• D. Huygen‚Äö√Ñ√∂‚àö√ë‚àö¬•s principle