Which of the Following Best Defines the Term Chain Reaction

Which of the following best defines the term chain reaction?

A) A reaction that occurs in a star
B) A nuclear product of one reaction becomes a nuclear reactant in a subsequent reaction
C) A nuclear reaction that can have many products, each linked to the other like links in a chain
D) A reaction that occurs in fusion reactors in which the reactant nuclei are chemically chained to one another
E) A reaction that occurs in fusion reactors in which the product nuclei are chemically chained to one another