A
Below is a question with multiple-choice answers. Choose the correct option based on your reasoning.

### Question:
Which of these does not illustrate substances reacting to form new substances?

### Choices:
A. H_{2}O(l) -> H_{2}O(g)
B. 2H_{2} + O_{2} -> 2H_{2}O
C. 2Na + Cl_{2} -> 2NaCl
D. 6CO_{2} + 6H_{2}O -> C_{6}H_{12}O_{6} + 6O_{2}

### Answer:
