The Accident at Three Mile Island Began When

Multiple Choice

The accident at Three Mile Island began when

A) the control rods didn't insert properly.
B) the moderator malfunctioned so that the reaction got out of control.
C) the pressurizer ruptured [i.e., broke open] and there was no backup pressurizer to replace it.
D) a water pump failed.
E) the heat exchanger failed to operate properly.