Which was the major goal of conservationists? a. using land wisely and managing it for the future b. establishing parks and public lands in towns and cities c. leaving vast acres of land untouched d. teaching natural sciences in schools

The major goal of conservationists would most likely be described as using land wisely and managing it for the future (A). However, conservationists would also support all of the other provisions in support of this goal such as establishing parks and public lands in towns and cities, leaving vast acres of land untouched, and teaching natural sciences in schools. 

The major goals of conservation was A) using lady wisely  and managing it for  the future.  because it would benefit the people and it would have better environment even though other answers would fit the prescription of the question, A) would be the overall goal which affects the most.