Halfway through a Sprint the Developers find that one selected item is far larger than they thought. They can still meet the Sprint Goal without it. Being self-managing, they simply delete the item from the Sprint Backlog and say nothing, planning to mention it at the Sprint Review. What should they have done?

Professional Scrum Master I, objective 2. Developing people and teams medium

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The options

Not correct Kept the item and worked overtime, because the Sprint Backlog was agreed at Sprint Planning and may not shrink

Wrong. The Sprint Backlog is updated throughout the Sprint as more is learned; it is the Sprint Goal that holds, not the item list.

Not correct Asked the Scrum Master to decide whether the item stays in the Sprint

Wrong. That is not a Scrum Master decision. Their part might be to help the conversation happen sooner, not to adjudicate scope.

Correct Collaborated with the Product Owner to renegotiate the scope of the Sprint Backlog, without affecting the Sprint Goal

Correct. Dropping the item is very likely the right outcome — what is wrong is reaching it alone, because scope is a shared decision with the Product Owner even though the plan is the Developers'.

Not correct Raised a change request with the stakeholders who asked for the item

Wrong. Stakeholders influence the product by convincing the Product Owner; routing scope decisions to them puts the decision outside the Scrum Team entirely.

Why

This is the sharpest edge of self-management: the Developers own the plan, and yet scope is renegotiated with the Product Owner. The reason is that dropping an item changes what the product gets, which is the Product Owner's domain, while how the remaining work is arranged is the Developers'. Two things distinguish a good answer here — that the Sprint Goal is untouched, and that the conversation happens when the discovery is made rather than at the Review.

Where this comes from

Cited
Scrum Guide section Commitment: Sprint Goal
What it says
they collaborate with the Product Owner to negotiate the scope of the Sprint Backlog within the Sprint without affecting the Sprint Goal.

Practise this

Reading one question is not practice. The trainer will draw a set from objective 2 and space the ones you get wrong.

Practise Professional Scrum Master I

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