Answer:
c. to preserve the health of mankind
Step-by-step explanation:
The motivating factor behind Theodore Roosevelt’s conservationist ideas was mainly to preserve the health of mankind, and all of his actions were based on this goal. Since he believed that the best way to accomplish this was to manage the nations resources wisely in order to benefit future generations. This was all due to the fact that Roosevelt believed that it was man's responsibility to care for the environment, which would benefit all of mankind.