surgery to release trigger fingers

A 68-year-old, 80-kg man presents for surgery to
release trigger fingers of the third and fourth digits of his
right hand. The surgeon’s time estimate for the surgery is
60 to 90 minutes. In performing IV regional anesthesia,
injection of which of the following will provide safe and
reliable surgical anesthesia for the hand?
A. 10 mL of 0.5% bupivacaine
B. 10 mL of 1% lidocaine
C. 10 mL of 0.25% bupivacaine
D. 20 mL of 0.125% bupivacaine
E. 50 mL of 0.5% lidocaine

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