Final answer:
The client at the lowest risk for development of postpartum thromboembolic disorders is the 22-year-old woman with her first pregnancy who has a history of thrombophlebitis caused by oral contraceptives.
Step-by-step explanation:
The client who would be at the lowest risk for development of postpartum thromboembolic disorders is option 4, the 22-year-old woman with her first pregnancy who states that oral contraceptives taken in the past have caused thrombophlebitis. One of the risk factors for postpartum thromboembolic disorders is a history of thrombophlebitis, which is inflammation in a vein caused by a blood clot formation. Since this client has a history of experiencing thrombophlebitis in the past as a result of oral contraceptive use, there is a higher likelihood of her not having any current clotting issues associated with her pregnancy.