Which statement correctly describes a chemical reaction?
a. reactants come out of a reaction.
b. energy is always released.
c. bonds between atoms break and new bonds form.
d. products go into a reaction.

C.Bonds between atoms break and new bonds form.

The best and most correct answer among the choices provided by the question is the third choice "Bonds between atoms break and new bonds form."
The substance (or substances) initially involved in a chemical reaction are called reactants or reagents. Chemical reactions are usually characterized by a chemical change, and they yield one or more products, which usually have properties different from the reactants.

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