Any Pre-conditions to be fulfilled for Sprint Planning

I recently came across the below question in Product Owner Open and wanted to check the suitability of option E (i.e Enough "Ready" Product Backlog to fill the Sprint) since Scrum Guide talks about Product Backlog items being deemed "ready" for selection in Sprint Planning through the Product Backlog Refinement exercise.

What pre-conditions must be fulfilled in order to allow Sprint Planning to begin?

A) A fully refined Product Backlog
B) Formal budget approval to conduct another Sprint
C) A clear and non-negotiable Sprint Goal
D) A clear but negotiable business objective for the Sprint
E) Enough "Ready" Product Backlog to fill the Sprint
F) There are no such pre-conditions