Pasteur's Experiments Proved That ________

Pasteur's experiments proved that ________.

A) cells cannot survive in swan-necked flasks
B) in order to grow, cells need to be supplied with oxygen
C) spontaneous generation can only occur if nutrient broth is left open to the environment
D) sterilizing nutrient broth prevents spontaneous generation
E) preexisting cells present in the air can grow in sterilized nutrient broth