Which of the following is most likely to cause the "aches and pains" many women experience in pregnancy?

Question

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The weight of the growing baby and uterus tends to pull a woman's center of gravity forward, which can affect her posture and, thus, her comfort. Pain in the back and pelvis is increased as a result of this shift. Moderate exercise is important for feeling good during pregnancy. An increase in blood volume can contribute to varicose veins and hemorrhoids. An increase in the production of the hormone relaxin softens ligaments. While this is beneficial at the time of birth, it can lead to discomfort and an increased risk of injuries, such as sprains and muscle pulls, during pregnancy.

Which of the Following Is Most Likely to Cause the "Aches