Arrange the following cardinal movements of labor in the correct order that the fetus typically goes through during a vaginal birth: 1. Extension 2. Engagement 3. External rotation 4. Descent 5. Flexion 6, Internal rotation

A. 4-2-5-6-1-3: This sequence places descent before engagement and flexion after engagement, which does not follow the typical progression of fetal movements during labor. Engagement usually occurs before descent. B. 2-5-4-6-3-1: This order incorrectly places flexion before descent and extension after internal rotation, which does not align with the physiological process of vaginal birth. The fetus must descend before extension occurs. C. 5-2-4-6-1-3: Starting with flexion before engagement is incorrect because engagement of the presenting part into the pelvis occurs prior to the fetus flexing its head. This disrupts the normal sequence of cardinal movements. D. 2-4-5-6-1-3: Engagement occurs first as the fetal presenting part enters the pelvic inlet, followed by descent through the birth canal. Flexion of the fetal head allows passage through the pelvis, internal rotation aligns the head with the maternal pelvis, extension occurs as the head crowns, and external rotation completes the birth of the shoulders.