I believe the answer is to inform.
D. A copy of your high school diploma
Five sources for informational text or research material are:
1) Books
2) Periodicals & Newspapers
3) Reliable Articles (both written or internet) that are not always one-sided
4) Documentaries
5) Historical records
It believe the answer is the second choice, "have a subject and a verb."
Independent clauses are complete sentences, which knocks out the third and fourth option.
Dependent clauses are not complete thoughts, knocking out the first option.
Throught the entire speech, Eisenhower tone remains positive and sincere. He speaks like he is just another average person, which makes him seem friendly. Example, Eisenhower ends the speech with a simple and unpretentious ¨Thank you, and good night¨and not with the new almost obligatory, ¨God bless the United States of America¨