Recall Pasteur's Experiment on Spontaneous Generation

Recall Pasteur's experiment on spontaneous generation. Originally, he used sealed and unsealed flasks instead of swan- necked and unsealed flasks. Critics claimed that the experiment was inconclusive. Which of the following criticisms would be addressed by using a swan- necked flask instead of the sealed flask?

A) Fresh air is required for spontaneous generation.
B) The broth was not nutritious enough.
C) There had not been enough time for spontaneous generation to occur.
D) The broth was heated too intensively.