Folic acid is a synthetic form of folate, a B vitamin that plays a role in the development of the neural tube, which becomes the brain and spinal cord of the fetus.

Neural tube defects are serious birth abnormalities that can cause disability or death.

Folic acid supplementation before and during pregnancy can significantly reduce the risk of neural tube defects.

Choice A is wrong because folic acid does not directly promote fetal brain development, although it is involved in the formation of the neural tube, which later develops into the brain.

Choice C is wrong because folic acid does not support healthy placental function.

The placenta is an organ that connects the mother and the fetus, and it does not depend on folic acid for its function.

Choice D is wrong because folic acid does not prevent maternal anemia.

Anemia is a condition in which the blood does not have enough red blood cells to carry oxygen.

Folic acid helps the body make new cells, including red blood cells, but it is not the only factor that affects anemia.

Iron deficiency is a more common cause of anemia during pregnancy.

The recommended daily intake of folic acid for pregnant women is 600 micrograms (mcg), which can be obtained from supplements and fortified foods.

Some natural sources of folate include spinach, avocado, and banana.