Final answer:
The correct therapeutic range for lithium is option B, 0.6-1.2 mEq/L, which is essential for safe and effective treatment of bipolar disorder.
Step-by-step explanation:
The therapeutic range for lithium is important to maintain in order to achieve the desired medicinal effects while minimizing the risk of toxicity. Among the options provided, the correct therapeutic range for lithium is B. 0.6-1.2 mEq/L. Lithium is used primarily in the treatment of bipolar disorder, and maintaining the appropriate concentration in the blood is crucial for patient safety. Levels above the therapeutic range can lead to lithium toxicity, which can be life-threatening.