Guys please helppp!!!!!


Unless otherwise instructed, you may use the periodic table in the Chemistry: Problems and Solutions book for this question.
Which reaction represents a nuclear reaction?
A. CO₂ + H₂O → H₂CO₂
B. U→ Th+ He²+
C. 2Na+ Cl₂ → 2NaCl
D. 2H₂O₂ → 2H₂ + O₂