A client with Hashimoto’s thyroiditis and a history of two myocardial infarctions and coronary artery disease is to receive levothyroxine (Synthroid). Because of the client’s cardiac history, the nurse would expect that the client’s initial dose for the thyroid replacement would be which of the following（）
A. 25 g/day, initially.
B. 100 g/day, initially.
C. Delayed until after thyroid surgery.
D. Initiated before thyroid surgery.