The Nurse Has Inserted the Vacutainer Needle into the Patient's

The nurse has inserted the Vacutainer needle into the patient's left median cubital vein, but when the tube is activated, it does not fill with blood. The nurse correctly suspects that

A) There is no suction in the evacuator tube.
B) The bevel of the needle is damaged in some way.
C) The evacuated tube is too small.
D) The tourniquet is apparently too tight to allow blood to enter the tube.