Two Children in the Same Family Have Recurrent, Chronic Bruising

Two children in the same family have recurrent, chronic bruising in multiple sites, repeated long-lasting epistaxis, and minor bleeding after dental work. Which type of disorder is most likely?
-Which of the following would be appropriate initial testing for the siblings in Question above?

A) fibrinogen, D-dimer, and platelet aggregation studies
B) factor VIII assay, liver function tests, and vitamin K level
C) von Willebrand factor (VWF) antigen, Bethesda titer, and reptilase time
D) prothrombin time (PT) , partial thromboplastin time (PTT) , and platelet count