A place adjoining kitchen, for washing dishes etc.

Answer: Option C

One word substitute is Scullery.

Cellar: a room below ground level in a house, often used for storing wine or coal.
Wardrobe: a large, tall cupboard or recess in which clothes may be hung or stored.
Scullery: a small kitchen or room at the back of a house used for washing dishes and other dirty household work.
Pantry: a small room or cupboard in which food, crockery, and cutlery are kept.