问题如下图：
选项：
A. 
B. 
C. 
解释：
老师你好，这道题目考察的知识点怎么理解呢，谢谢解答
NO.PZ2016031001000133 问题如下 A manufacturing company receives a ratings upgra anthe priincreases on its fixerate bon The priincrease wmost likely causea(n): A.crease in the bons cret sprea B.increase in the bons liquity sprea C.increase of the bons unrlying benchmark rate. A is correct.The priincrease wmost likely causea crease in the bons cret sprea The ratings upgra most likely reflects a lower expecteprobability of fault anor a greater level of recovery of assets if fault occurs. The crease in cret risk results in a smaller cret sprea The increase in the bonprireflects a crease in the yielto maturity e to a smaller cret sprea The change in the bonpriwnot e to a change in liquity risk or increase in the benchmark rate. 考点Cret anLiquity Sprea析Acret sprea即信用溢价。sprea在折现率中，cret sprea降低使得折现率变小，债券价格就会上升。因此A正确。Bliquity sprea即流动性溢价。sprea在折现率中，liquity sprea增加使得折现率变大，债券价格就会下降。因此B不正确。Cbenchmark rate的增加使得分母变大，债券价格下降，因此C不正确。 评级提高，债券信用也会提高，sprea该增加不是？
NO.PZ2016031001000133 这道题price上升（卖的贵了）是不是这个债券的coupon-rate就会下降？
请问一下题目里的fixerate bon不是应该改成floaterate bonfixerate bon有sprea吧？谢谢！
信用评级上升，流动性也会相应提高，这样的话B错在哪里呀？谢谢
