Serum Lithium Level Is Important to Monitor Because It Has

Serum lithium level is important to monitor because it has a narrow therapeutic range. What is the reference (therapeutic) range?

A) 0.5 to 1 mEq/L
B) 0.5 to 1.5 mEq/L
C) 1.5 to 3 mEq/L
D) 2 to 2.5 mEq/L