Final answer:
Taking folic acid in the first trimester of pregnancy helps reduce the risk for neural tube defects such as spina bifida and anencephaly. Therefore, the correct option is C.
Step-by-step explanation:
Taking folic acid in the first trimester of pregnancy helps reduce the risk for neural tube defects. Neural tube defects are birth defects that occur when the neural tube, which forms the baby's brain and spinal cord, does not develop properly. Examples of neural tube defects include spina bifida and anencephaly. Folic acid supplementation is important to ensure the healthy development of the neural tube and prevent these disorders.