Answer:
The question is incomplete since the requirements are missing, so I looked for similar questions and found that you should advice this client either to form a sole proprietorship, partnership or corporation.
Since this client wants to focus solely on inventing new candies, he would be better off by forming a corporation. That way, he and other stockholders can elect a board of directors which will appoint an appropriate upper management team to run the business.
The other two types of businesses, sole proprietorships and partnerships require that the owners actively participate in managing the business, and that is something that the client wants to avoid. This happens because sole proprietors and partners are personally liable for all the business obligations. On the other hand, corporations are managed by a professional team.