Which of the Following Is a Limitation of the National

Which of the following is a limitation of the national income accounting system?  

A)  This system values all output at its market price regardless of whether it contributes to a society's economic welfare. 
B)  This system places a market value on all positive externalities but ignores negative externalities. 
C)  This system ignores consumption spending. 
D)  This system ignores government production of goods and services.