A newborn infant was treated with antibiotics due to an infection. The population of Bifidobacterium in her gut was greatly diminished. What would you predict could result from this change?

a. Greater health in the absence of Bifidobacterium.
b. Poor digestion of milk.
c. She will have better ability to digest plant biomass.
d. No serious result, since it only acts prenatally.
e. Slower growth rate.