This symptom is most likely due to carpal tunnel syndrome, which is a common condition in pregnancy caused by fluid retention and swelling in the wrists that compresses the median nerve, which controls feeling and movement in the hand.

Some possible explanations for the other choices are:

• Choice A is wrong because increased joint laxity is caused by the hormone relaxin, which loosens the ligaments and joints to prepare for childbirth. This can cause pain and instability in the pelvis, hips, and lower back, but not numbness and tingling in the hands.

• Choice B is wrong because increased spinal curvature is a result of the growing uterus and shifting center of gravity, which can cause back pain and posture changes, but not numbness and tingling in the hands.

• Choice D is wrong because decreased muscle strength is not a common symptom of pregnancy, unless it is due to an underlying condition such as anemia or thyroid problems. Numbness and tingling in the hands can affect grip strength and finger dexterity, but this is a consequence of carpal tunnel syndrome, not a cause.

Normal ranges for fluid retention and swelling in pregnancy vary depending on the individual, but some signs of excessive or abnormal swelling include sudden or severe swelling in the face, hands, or feet; swelling that does not go down after resting or elevating the limbs; or swelling that is accompanied by other symptoms such as headache, vision changes, or high blood pressure. These could indicate a serious condition such as preeclampsia, which requires immediate medical attention.