【单选题】When the "invisible hand" guides economic activity, prices of products reflect
A.
only the values that society places on those products.
B.
only the costs to society of producing those products.
C.
both the values that society places on those products and the costs to society of producing those products.
D.
none of the above; when the "invisible hand" guides economic activity, prices of products are set by the government in a manner that is thought to be "fair."