The correct answer is C, because the Scrum Guide states that "the Development Team usually starts by designing the system and the work needed to convert the Product Backlog into a working product Increment. Work planned for the first days of the Sprint by the Development Team is decomposed by the end of this meeting, often to units of one day or less. The Development Team self-organizes to undertake the work in the Sprint Backlog, both during Sprint Planning and as needed throughout the Sprint." Therefore, enough work should be defined during the Sprint Planning event so that the Development Team can create its best forecast of what it can do, and to start the first several days of the Sprint.

Explanation/Reference:

The Product Backlog is ordered by the Product Owner with the most valuable items placed at the top, as stated in [6]: "The Product Owner is responsible for ordering items on their product backlog based on their value to customers and users. Value can be measured by various factors, such as business value, customer satisfaction, risk reduction, learning opportunities, etc. The most valuable items are placed at the top of the product backlog so that they can be delivered sooner by the development team."

All of the above topics should be discussed in the Sprint Review, as stated in [4]: "The purpose of this meeting is to inspect what was delivered during this sprint and adapt what we want to deliver next. This means we will discuss three things:
What did we do this sprint?
How did we do it?
What do we want to do next?"