Read the following excerpt from "The Significance of the Frontier in American History":
In this connection may be mentioned the importance of
the frontier, from that day to this, as a military training school, keeping alive the power of resistance to
aggression, and developing the stalwart and rugged qualities of the frontiersman."

How does Turner's word choice affect the tone of this excerpt?
A. The words "importance of the frontier" and "military training school" give it a positive tone.
B. The words "the power of resistance to aggression" and
"developing the stalwart and rugged qualities" give it a positive
tone.
C. The words “military training school” and “resistance to aggression” give it a negative tone.
D. The words “power of resistance” and “qualities of the frontiersman” give it a negative tone