A nurse is assessing a young child and suspects coarctation of the aorta based on which finding?

The correct answer is D: Unequal upper and lower extremity pulses. Coarctation of the aorta causes a narrowing of the aorta, leading to decreased blood flow to the lower extremities. This results in weaker pulses in the lower extremities compared to the upper extremities. A diastolic murmur (A) is more indicative of aortic regurgitation. Hypotension (B) is not specific to coarctation of the aorta. Excessive crying (C) is a non-specific finding and not directly related to coarctation of the aorta.