The Dollar Value of Final Goods and Services Only Is

The dollar value of final goods and services only is counted in GDP because:

A) we can measure only the value of final goods and services, not the value of inputs.
B) if we counted the value of all goods, we would count inputs, like the value of steel in a new automobile, more than once.
C) intermediate goods reduce GDP.
D) only final goods and services matter for the economy.