含有1mol HNO3的稀硝酸分别与不同质量的铁粉反应，所得氧化产物a、b与铁粉物质的量关系如图所示（已知稀硝酸的还原产物只有NO）。下列有关判断正确的是 （ ） 
| A．a是Fe(NO3)2 | B．n1 = 0．375 |
| C．p = 0．20 | D．n2 = 0．30 |
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