What Is the Meaning of the Term "Critical Mass

Multiple Choice

What is the meaning of the term "critical mass"?

A) This refers to the mass of the "critical" elements in a reactor, i.e., the uranium or plutonium.
B) This refers to the minimum amount of fissionable material required to sustain a chain reaction.
C) This refers to the maximum amount of fissionable material required to sustain a chain reaction.
D) This is the amount of mass needed to make a power reactor economically feasible.
E) This is the material which is just on the verge of becoming radioactive.