问题如下：
What assumptions does a duration-based hedging scheme make about the way in which interest rates move?
选项：
A. All interest rates change by the same amount.
B. A small parallel shift occurs in the yield
curve.
C. Any parallel shift occurs in the term
structure.
D. Interest rate’s movements are highly
correlated.
解释：
ANSWER: B
The assumption is that of (1) parallel and (2) small moves in the yield curve. Answers A and C are the same, and omit the size of the move. Answer D would require perfect, not high, correlation plus small moves.
所以B选项是包括了A和C的前提下在加上小幅移动？
