Behavioral Science & Ethics USMLE Step 1 Practice Question

A 9-year-old girl is brought to the pediatrician by her adoptive parents for evaluation of academic difficulties that began 7 weeks ago. Her third-grade teachers report that she is easily frustrated, has difficulty concentrating during lessons, and demonstrates impulsive behavior in class. She has also struggled to develop friendships with peers. Her biological mother had a significant history of alcohol use disorder throughout pregnancy and did not receive prenatal care. On vital signs, the patient is normothermic with normal blood pressure and heart rate. Physical examination reveals a flattened nasal bridge, a long philtrum, thin upper vermilion border, and small palpebral fissures. Anthropometric measurements show height at the 15th percentile and weight at the 35th percentile. Psychoeducational testing reveals an IQ of 78. Which of the following is the most likely explanation for this patient's constellation of findings?