Answer:
The correct answers is B. Causing fear.
Explanation:
Formidable is an adjective, which means, to cause awe or concern, also in other context It means to be tough or impressive. However, If we add the suffix –ness to it, it becomes a noun, so its conjugation as seen in the extract becomes completely different; but not the meaning, as the text implies exactly this meaning: sense of the formidableness of an enemy / a sense of fear and impression of the enemy.
