下列关于电离平衡常数(K)的说法中正确的是

A．电离平衡常数(K)越小，表示弱电解质电离能力越弱

B．电离平衡常数(K)与温度无关

C．不同浓度的同一弱电解质，其电离平衡常数(K)不同

D．多元弱酸各步电离平衡常数相互关系为：K₁<K₂<K₃

James McDonald and Veasna Lu were discussing different ways of valuing a Treasury security. During their discussion Lu made the following statements: Statement 1: It is inappropriate to discount the cash flows of a Treasury security by a single discount rate because that is implicitly assuming that the yield curve is flat. Therefore, each individual cash flow should be discounted by its corresponding spot rate. Statement 2: The spot rates used for different time periods that produce a value equal to the market price of a Treasury bond are called forward rates or future expected spot rates. Are the statements made by Lu regarding bond spot rates correct Statement 1 Statement 2 （）①A. Correct Correct②B. Incorrect Incorrect③C. Correct Incorrect

A. ①

B. ②

C. ③