Correct option is D
The most appropriate antonym of the highlighted word "anxiety" is "calmness."
· Anxiety: A feeling of worry, nervousness, or unease.
· Calmness: The state or quality of being free from agitation or strong emotion, which is the opposite of anxiety.
· Synonyms: Worry, nervousness, unease, apprehension.
· Antonyms:
Calmness, tranquility, peace, serenity.
Meanings of other given words:
· Shrewdness: The quality of having or showing sharp powers of judgment.
· Wilderness: An uncultivated, uninhabited, and inhospitable region.
· Feebleness: The quality of lacking physical strength, especially as a result of age or illness.