Foramen Ovale and Atrial Septal Defects
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Explanation:
The most common form of atrial septal defect is located near the foramen ovale (not to be confused with a patent foramen ovale, which is of little or no hemodynamic significance). They result from incomplete adhesion between the septum primum and the septum secundum during development.
Atrial septal defects less commonly result from failures of formation of the septum primum (choice A) and 
septum secundum (choice B). Malformations of the interventricular septum (choices D and E) cause ventricular septal defects rather than atrial septal defects.
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