Inherited coagulation defects

A typically healthy young male patient presents with significant bleeding after a minor dental procedure. The lab results indicate a normal PT and a normal bleeding time, but a prolonged aPTT. Which of the following disorders is MOST likely affecting this patient?

1: Hemophilia A
2: Von Willebrand Disease
3: Aortic Stenosis
4: Systemic Lupus Erythematosus