Which of the following best describes O'Brien's tone and its recipient in "Speaking of Courage"?
A.} A grateful tone toward the American towns that welcomed soldiers home from Vietnam
B.} A sympathetic tone toward unacknowledged soldiers who'd returned from Vietnam
C.} A hostile tone toward the American Government for not ending the war in Vietnam sooner
D.} A bitter tone toward soldiers who'd returned from Vietnam without having the courage to save their friends