Read the excerpt from Obama's Second Inaugural Address. For the American people can no more meet the demands of today’s world by acting alone than American soldiers could have met the forces of fascism or communism with muskets and militias. No single person can train all the math and science teachers we’ll need to equip our children for the future, or build the roads and networks and research labs that will bring new jobs and businesses to our shores. Now, more than ever, we must do these things together, as one nation and one people.

How is President Obama using an appeal to reason, or logos, in this excerpt?

by explaining why each person must work hard in order to succeed
by explaining why working together is necessary for success
by explaining why attempts at working together in the past failed
by explaining why each person must look out for him or her self