Knowing How Children Form the Foundation of Their Microbiomes, What

Knowing how children form the foundation of their microbiomes, what can you conclude about children born by Caesarean section?

A) They would have a more robust microbiome because they did not have to endure the stress of a vaginal delivery.
B) They would have a more robust microbiome because their birth took place in an operating room under sanitary conditions.
C) They would have a weaker microbiome because they were not exposed to bacteria in the mother's vagina.
D) They would have a weaker microbiome because the mother would have received anesthesia.