Ramon is a new nurse preparing a patient's drug regimen of vancomycin. Vancomycin comes in packages of 100mL that contain 50mg each. The patient has a mass of 91 kg. The minimum safe dosage range for vancomycin is 15-20 mg/kg. How many mL of vancomycin should the patient receive for each dose?
a) 18.2 mL
b) 20.0 mL
c) 22.0 mL
d) 25.0 mL