单选题 Which of the following statements about the yield curve is TRUE? A. A nonparallel shift occurs when rates change by the same number of basis points for all maturities. B. A nonparallel shift is more common than a parallel shift. C. The yield curve usually has a non zero slope because rates change by approximately the same number of basis points across maturities.

【正确答案】 B

【答案解析】The definitions for parallel and nonparallel shifts are reversed. The first part of the C statement that begins, "The yield curve usually has a nonzero slope" is correct. However, the second part is incorrect-the slope occurs because rates change by different basis points across maturities.