Read the excerpt from "Keynote Address.”

Under the health measures first proposed by the Presidency of our most beloved Harry S. Truman and passed during the remarkable administration of Lyndon B. Johnson, 20 million older Americans are now protected under Medicare. Our elder Americans can now live their autumn years in dignity and security. And infant mortality has declined to a new low. And federally funded community health centers are now serving nearly 50 million Americans. These too are vital foundations, and on them we must build fuller lives for our citizens.

And since 1963, President Johnson has proposed and Congress had enacted more than 40 major new laws to foster education in our country. Since 1963, our Government has tripled its investment in education, and in the past four years alone, we have invested twice as much as was spent in the previous 100 years. These are the foundations from which towers of human achievement can soar.

The last 11 years have seen the passage of the five civil rights laws passed during the entire history of the United States, and I might note in passing that Lyndon Baines Johnson is the author, chief architect, or primary sponsor of each of the civil right laws. When all summers are long and hot, it is well to remember that the 100 years of the Emancipation Proclamation is finally but slowly but becoming a reality. And the occupants of some of our highest offices are testimony that black talent is just as important as white talent.

Working together, we have done much. We can, and we must do much, much more.

How does the speaker best develop logos in this excerpt?

by presenting the results of polls
by including opinions of government officials
by presenting numerous facts and statistics
by challenging the audience to do more