What is the primary difference between nuclear reactions and regular chemical reactions?

• A. Nuclear reactions involve changes in the number of protons, while chemical reactions do not.
• B. Nuclear reactions only occur in non-radioactive elements, while chemical reactions occur in radioactive elements.
• C. Nuclear reactions involve changes in electron configurations, while chemical reactions involve changes in protons.
• D. Nuclear reactions do not affect the identity of elements, while chemical reactions do.

Answer: (A)