Please choose the correct ending to complete the given sentence: Health: [header] How to help prevent ovarian cancer [title] Reduce your risk with your reproductive choices. [step] Although scientists aren't sure why, you can reduce your risk for ovarian cancer by making certain choices about having children and controlling your fertility. [substeps] You can reduce your risk for ovarian cancer by having at least one baby.

Ending1: By having at least one child, you can help control your fertility-even if it means limiting your income and relationships with your family. There is no point in putting off the pregnancy, however, when you could have an unwanted baby. Ending2: This is the healthiest form of women to have in your family, though there are still some kids to consider. This may mean eliminating your biological mother's pregnancy or having a family marriage. Ending3: Studies show that the more pregnancies you have, the more you can reduce your risk. You can also reduce your risk by using birth control pills (containing both estrogen and progesterone) for at least five years. Ending4: You also have a more health-related reason for wanting to have children. Some ways to help control your fertility include smoking, drinking more water, exercising more, maintaining a diet rich in tryptophan, and increasing your physical fitness.

Answer format: ending1/ending2/ending3/ending4