Considering the Wide Array of Factors That Affect the Brain

Considering the wide array of factors that affect the brain before conception, during the prenatal phase, after birth, and throughout life, how do any of us develop a normal brain?

A) Scientific advances allow for a greater range of treatments than ever before.
B) The brain's plasticity can overcome minor developmental deviations.
C) The microbiome of the gut reverses these developmental deviations.
D) There is no such thing as a normal brain.