Answer:
The correct answer is: Persuasion.
Explanation:
In this excerpt, President Obama evidently uses persuasion, one of the most important rhetorical means, in order to convince the audience that the U.S. needs a strategy to provide better sources than other countries.
He also appeals to their emotions, by involving the audience into the scenario, as he considers the U.S. citizens responsible for all achieved efforts and invites them to accept his proposal.