According to the U

According to the U.S. Department of Energy, the U.S. could meet the carbon emission reduction targets in the Kyoto Protocol

A) at a cost of approximately $5 to $10 billion a year.
B) at a savings of $7 to $37 billion a year.
C) at a cost of approximately $10 to $15 billion a year and with a risk of higher unemployment.
D) without any economic benefits or detriments.