President Theodore Roosevelt statement below shows that he was a concerned -

"We have become great because of the Lavish use of our resources. But the time has come to inquire seriously what will happen when our forests are gone, when the coal, the iron, the oil and the gas are exhausted, when the soils have still further impoverished and washed into the streams, polluting the Rivera, denuding the fields and obstructing navigation.
A.) Conservationist
B.) Socialist
C.) Industrialist
D.) Pacifist ​