Correct option is A
‘piece’ is the wrong usage here, and the correct usage will be ‘peace’
Piece: a portion of an object or of material, produced by cutting, tearing, or breaking the whole
Peace: freedom from disturbance; tranquility.
Additional information:
Word: peace
Part of Speech: Noun
Definition: Peace is a state of tranquility, calmness, and freedom from disturbances or conflicts. It is a condition of harmony and absence of hostility or violence.
Example Sentence: The garden was a place of peace and serenity, where one could relax and find inner calm.