The Development Team discovers that it doesn't have the tools and infrastructure to make each selected Product Backlog i

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The Development Team discovers that it doesn't have the tools and infrastructure to make each selected Product Backlog item done.
What is the most appropriate action for the Scrum Master to take?

A. Stop the Sprint and have the Development team work on the infrastructure before continuing.
B. Encourage the Product Owner to accept partially done Increments and complete the work in the Hardening Sprint.
C. Coach the Development Team to improve its skills, tools and infrastructure over time and establish a Definition of ג€Doneג€ that is actually possible to achieve given the current circumstances.