单选题 Trimethobenzamide (Tigan) 150 mg IM has been ordered to treat a client's nausea and vomiting. The nurse has an ampule of Tigan labeled 200 mg/mL. How many mL should the nurse prepare to give the client?
A. 0.50 mL.
B. 0.75 mL.
C. 1.0 mL.
D. 1.5 mL.