Answer:A Limited Partnership
Explanation:A Limited Partnership is a partnership in which there is a general partner who is in charge of managing the business and who is liable for all obligations in this partnership. There is also a limited partner who is not fully liable and doesn't take part in managing the business
"Soni spends all her time running the business, and makes all the decisions."
Sonia is obviously a general partner, because of all these duties; she runs the business and makes the decisions.
"Sonia's mother and brother put up money for her to buy the store, but they work full time at other jobs and have no management ". Her mother and brother are limited partners since they only out money but are not managing the business.