There is a set of commercial housing, the owner is Xiaofeng (6 years old), and he wants to sell the commercial housing to Ding. Commercial housing sales contract should be signed by ().

B Xiaofeng is under the age of 10 and belongs to a person without civil capacity. Article 12 of the General Principles of Civil Law stipulates that minors over the age of 10 are persons with limited capacity for civil conduct and may engage in civil activities appropriate to their age and intelligence; Other civil activities shall be represented by their legal representatives or with the consent of their legal representatives. Minors under the age of 10 are persons without capacity for civil conduct, and their legal representatives act as agents in civil activities.

Although people without civil capacity can also accept pure benefits such as gifts, rewards and remuneration, this topic is obviously not included.