According to the Scrum Guide 1 , the Daily Scrum is an event for the Developers of the Scrum Team. The purpose of the Daily Scrum is to inspect progress toward the Sprint Goal and adapt the Sprint Backlog as necessary, adjusting the upcoming planned work. The Daily Scrum optimizes the probability that the Developers will meet the Sprint Goal. Every day, the Developers should understand how they intend to work together as a self-organizing team to accomplish the Sprint Goal and create the anticipated Increment by the end of the Sprint. If the frequency of the Daily Scrum were to be lowered to every two or three days, some key concerns would be:
* Opportunities to inspect and adapt the Sprint Backlog are lost, which may result in wasted work or missed dependencies.
* Impediments are raised and resolved more slowly, which may hinder the progress and quality of the work.
* The Sprint plan may become inaccurate, as changes in requirements, risks, or priorities are not reflected in a timely manner.
The other options are not valid concerns, as they are not aligned with Scrum values and principles.
References: Scrum Guide

According to the Scrum Guide 1 , when multiple Scrum Teams are working together on the same product, they must mutually define and comply with the same definition of "Done", which includes creating an integrated Increment at least by the end of each Sprint. The Scrum Master should teach and coach the Developers that it is their responsibility to work with other Scrum Teams to create an integrated Increment that meets the definition of "Done". The other options are not aligned with Scrum values and principles.
References: Scrum Guide

A Sprint may be cancelled only if the Sprint Goal becomes obsolete. This makes Option A the correct answer.
The Scrum Guide is very clear that only the Product Owner has the authority to cancel a Sprint, although that decision may be influenced by stakeholders, the Developers, or the Scrum Master. The reason for cancellation is not general disruption, poor forecasting, or the appearance of new work. It is specifically tied to the Sprint Goal no longer having value or relevance.
Option B is incorrect because a new business opportunity does not automatically justify cancelling a Sprint.
Scrum is designed to handle change without disrupting the Sprint unless the Sprint Goal itself is no longer valid. Option C is incorrect because feasibility concerns should be addressed through collaboration and adaptation, but they do not by themselves define the cancellation rule. Option D is incorrect because not finishing all selected work is not a reason to cancel a Sprint. Scrum accepts uncertainty, and the team inspects and adapts. The Sprint Goal remains the key commitment, and as long as it is still relevant, the Sprint should continue.

According to the Scrum Guide, an Increment does not have to be released to customers or users at the end of each Sprint. However, it must be in a usable condition and meet the Definition of Done. The decision to release an Increment is made by the Product Owner, based on the value and feedback obtained from stakeholders. The other option is not valid, as it implies that releasing an Increment is mandatory at the end of each Sprint.

According to the Scrum Guide, the Scrum Master is responsible for coaching the Scrum Team to improve its skills, tools and environment over time and adjust the Definition of Done accordingly 1 . The Definition of Done is a formal description of the state of the Increment when it meets the quality measures required for the product 1 . The Definition of Done should be possible to achieve given current circumstances 2 . Therefore, option B and E are appropriate for a Scrum Master to do, if the Scrum Team does not have the tools and environment to completely finish each selected Product Backlog item.
Option A is not appropriate because declaring the Scrum Team not ready for Scrum implies that there is a fixed set of prerequisites for using Scrum, which is not true. Scrum is a framework that can be applied to any complex product development effort 1 .
Option C is not appropriate because encouraging the Product Owner to accept partially done Increments until the situation improves violates the principle of transparency. Transparency requires that the Increment is a usable product that meets the current Definition of Done 1 . Accepting partially done Increments also increases technical debt and reduces value delivery 3 .
Option D is not appropriate because refocusing the current Sprint on establishing the Scrum Team's environment instead of delivering an Increment goes against the purpose of a Sprint. A Sprint is a time-boxed event that serves as a container for the other Scrum events and activities. The goal of each Sprint is to deliver a potentially releasable Increment that adheres to the current Definition of Done 1 .
References: 1 : The Scrum Guide 2 : Suggested Reading for Professional Scrum Master I 3 : Mastering Professional Scrum