Ms Chisholme Has Been Admitted to Hospital for an Appendicectomy

Ms Chisholme has been admitted to hospital for an appendicectomy. She has a history of a previous deep vein thrombosis, she is on an oral contraceptive pill and she smokes 20 to 25 cigarettes per day. The following seven questions relate to her management.
-She asks for medication to relieve her pain, and 7.5 mg of morphine is ordered. Stock available is 15 mg/ml. The volume required for this order is

A) 0.4 ml
B) 0.5 ml
C) 0.6 ml
D) 0.7 ml