On the Basis of the Position of the Three-Way Stopcock

On the basis of the position of the three-way stopcock shown here, identify which of the following activities related to arterial lineblood sampling is occurring.

A) The therapist is aspirating blood diluted with infusion fluid.
B) The therapist is withdrawing blood from the arterial line.
C) The therapist is keeping the stopcock in its normal operational position.
D) The therapist is infusing fluid back into the system after having removed a blood sample.