Which phrase from "conservation as a national duty” identifies the historical context of this source? “governors of the several states; and gentlemen” “join together to consider the question of the conservation and use of . . sources of wealth” “the natural resources . . are in danger” “crops are cultivated; animals are domesticated; and metals are mastered”

(B) Join together to consider the question of the conservation and use of . . . sources of wealth.

Explanation:

The phrase that most directly relates to and identifies the historical context of "Conservation as a National Duty" is B: “join together to consider the question of the conservation and use of . . . sources of wealth."  

This answer is rather apparent as it is the only which remotely focuses on the primary focus of Teddy's speech, which centered around the conservation and use of the nation's source of wealth.

Governers of Several States, Natural Resources, and Crop/Animal life have absolutely nothing to do with the source as a WHOLE, these were just independent focuses within the speech and inferior to the larger point, as they do NOT relate to the source.

Your answer is B.

d)to gain support for the independence movement.

hope this : )

a. by accepting the election of president abraham lincoln in 1860 and convincing other southern states to do the same