What is the main reason to limit Scrum Teams to 9 team members?

Between traditional Project Management and Scrum, differences exist in how quality is achieved and/or implemented. In this respect, which of the following is NOT true?

You are the Scrum Master for a project in a new Scrum environment. The Development Team is confused about their responsibilities in a Sprint. Of the following which one is not part of the Development Team's responsibilities?

You are a Scrum Master on a project creating an optical fiber cable network across the country. The project has reached the Create User Stories process. Which of the following is NOT an input to this process?

A Scrum Team is supposed to deliver potentially snippable software at the end of each Sprint. During the last Sprint the Team did not deliver a potentially shippable increment.
The correct question to ask is: "What can we do to make sure we do better in the next Sprint?" Who is responsible for making sure this question asked?