Which of the Following Statements Is MOST Accurate Regarding US

Which of the following statements is MOST accurate regarding US environmental legislation since 1970?

A) Has been mostly successful -- many endangered species are recovering, soil erosion has declined more than 60%, emissions of six important air pollutants have dropped by more than 25%.
B) Has mainly been a failure - most endangered species have gone extinct, soil erosion has increased 60%, levels of wet sulfate, a major component of acid rain, have increased by 20%.
C) Has been mixed - many endangered species are recovering, much farmland has been conserved, but air pollution and water pollution are worse than in the 1970s.
D) Has had little effect - little land has been conserved, no endangered species have been recovered, and pollution levels have not changed much since the 1970s.