The correct option is B Pottery
The primary sector predominantly uses natural resources to produce natural products. Hence, gardening and pottery are primary sector activities.
The secondary sector comprises activities in which the natural products are converted into other products through some manufacturing process. Hence, food processing is a secondary sector activity.
The tertiary sector provides services that help the primary and secondary sectors in production. Milk vending is classified as a tertiary sector activity as there is no production of natural product. It is a service.