A third-trimester pregnant client reports that her shoes no longer fit comfortably. She asks if it's normal for her feet to feel larger. Which of the following is the nurse's best response?

A. " Increased levels of relaxin and progesterone during pregnancy cause joint and ligament laxity, including in the feet. Combined with weight gain and fluid retention, this leads to arch flattening and mild, often permanent, foot size increase. B. Foot infections typically present with localized redness, pain, and warmth rather than generalized foot enlargement. In this case, bilateral and gradual changes are physiological, not infectious. C. Calcium loss from the bones does not cause enlargement or shape changes in the feet. Pregnancy-related calcium shifts mainly support fetal bone development and do not result in deformities or foot growth. D. Foot swelling or enlargement is unrelated to fetal growth restriction. It reflects maternal musculoskeletal and circulatory changes, not a complication affecting fetal development.