Mr Joel Daniels Has Been Admitted to the Ward with Pneumonia

Mr Joel Daniels has been admitted to the ward with Pneumonia. He has a history of heart disease. The registered nurse who is working with you has asked you to work out the required volumes for the medications she is about to give him. The following three questions relate to his care.
-Intravenous Gentamicin 240 mg (an antibiotic) has been ordered to be given at once. Stock available is 40 mg/ml. The volume is required for this order is

A) 2 ml
B) 4 ml
C) 6 ml
D) 8 ml