The correct answer is D. He uses pathos to appeal to the listeners' suspicion and fear of Germany.
Step-by-step explanation
In this speech extract, Winston Churchill refers to the character of his enemies (Germans) referring to them as "The enemy is crafty and cunning and full of novel treacheries and stratagems", this speech expresses an idea of the enemy to the listeners to awaken their feelings of suspicion and fear. From the above, it can be inferred that this speech makes use of Pathos (speech that alude to feelings of listeners) to move the feelings of the listeners. Therefore, the correct answer is D. He uses pathos to appeal to the listeners' suspicion and fear of Germany.