Boosting the intake of _________ can help women trying to conceive

The correct option is Folic acid.

Folic acid (also known as folate or vitamin B₉) is a crucial nutrient recommended for women who are trying to conceive or are in the early stages of pregnancy. It plays a vital role in preventing neural tube defects (NTDs), which are serious birth defects of the brain and spinal cord, such as spina bifida and anencephaly.
Because the neural tube develops in the first few weeks of pregnancy—often before a woman even realizes she is pregnant—maintaining adequate folic acid intake prior to conception is essential for healthy fetal development.