What mode does Churchill employ in the following sentence in his " Speech on Hitler's Invasion of the U.S.S.R."? "He wishes to destroy the Russian power because he hopes that if he succeeds in this he will be able to bring back the main strength of his Army and Air Force from the East and hurl it upon this Island, which he knows he must conquer or suffer the penalty of his crimes."
选项：

A:emotion
B:ethics
C:reasonning
D:credibility