A 67-Year-Old Woman Arrives at the Emergency Department with Acute $\degree$

A 67-year-old woman arrives at the emergency department with acute bleeding into the back of the throat. A coagulation screen is ordered with the following results:

What would be a reasonable next step to perform?

A) Perform factor IX assay.
B) Perform factor VII assay.
C) Incubate the 1:1 mix at 37 $\degree$ C for 1 hour and then repeat the PTT.
D) Perform TT.