题目内容
（请给出正确答案）
[单选题]
Debt securities are often called fixed-income securities because（）
A.the government fixes the maximum rate that can be paid on bonds.
B.they are held predominantly by older people who are living on fixed incomes.
C.they pay a fixed amount at maturity.
D.they promise either a fixed stream of income or a stream of incomedetermined by a specific formula.
E.they were the first type of investment offered to the public, which allowedthem to “fix” their income at a higher level by investing in bonds.
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